diff --git a/include/core/wildmoninfo.h b/include/core/wildmoninfo.h
index f9011c9c..51eed213 100644
--- a/include/core/wildmoninfo.h
+++ b/include/core/wildmoninfo.h
@@ -19,10 +19,15 @@ struct WildPokemonHeader {
     QMap<QString, WildMonInfo> wildMons;
 };
 
-typedef QVector<QPair<QString, QVector<int>>> Fields;
-typedef QPair<QString, QVector<int>> Field;
+struct EncounterField {
+    QString name;
+    QVector<int> encounterRates;
+    QMap<QString, QVector<int>> groups;
+};
 
-WildMonInfo getDefaultMonInfo(Field field);
-WildMonInfo copyMonInfoFromTab(QTableWidget *table);
+typedef QVector<EncounterField> EncounterFields;
+
+WildMonInfo getDefaultMonInfo(EncounterField field);
+WildMonInfo copyMonInfoFromTab(QTableWidget *table, EncounterField monField);
 
 #endif // GUARD_WILDMONINFO_H
diff --git a/include/editor.h b/include/editor.h
index 7e1ec0ee..bfb0ee95 100644
--- a/include/editor.h
+++ b/include/editor.h
@@ -146,7 +146,7 @@ private:
     void updateMirroredConnectionDirection(MapConnection*, QString);
     void updateMirroredConnectionMap(MapConnection*, QString);
     void updateMirroredConnection(MapConnection*, QString, QString, bool isDelete = false);
-    void updateEncounterFields(Fields newFields);
+    void updateEncounterFields(EncounterFields newFields);
     Event* createNewObjectEvent();
     Event* createNewWarpEvent();
     Event* createNewHealLocationEvent();
diff --git a/include/project.h b/include/project.h
index 8609b899..a0195b2f 100644
--- a/include/project.h
+++ b/include/project.h
@@ -91,7 +91,7 @@ public:
 
     void readWildMonData();
     QMap<QString, QMap<QString, WildPokemonHeader>> wildMonData;
-    QVector<QPair<QString, QVector<int>>> wildMonFields;
+    QVector<EncounterField> wildMonFields;
     QVector<QString> encounterGroupLabels;
     QMap<QString, QJsonObject> extraEncounterGroups;
 
diff --git a/src/core/wildmoninfo.cpp b/src/core/wildmoninfo.cpp
index 1769dc93..d411071a 100644
--- a/src/core/wildmoninfo.cpp
+++ b/src/core/wildmoninfo.cpp
@@ -4,26 +4,28 @@
 
 
 
-WildMonInfo getDefaultMonInfo(Field field) {
+WildMonInfo getDefaultMonInfo(EncounterField field) {
     WildMonInfo newInfo;
     newInfo.active = true;
     newInfo.encounterRate = 0;
 
-    for (int row : field.second)
+    int size = field.encounterRates.size();
+    while (size--)
         newInfo.wildPokemon.append(WildPokemon());
 
     return newInfo;
 }
 
-WildMonInfo copyMonInfoFromTab(QTableWidget *monTable) {
+WildMonInfo copyMonInfoFromTab(QTableWidget *monTable, EncounterField monField) {
     WildMonInfo newInfo;
     QVector<WildPokemon> newWildMons;
 
+    bool extraColumn = !monField.groups.isEmpty();
     for (int row = 0; row < monTable->rowCount(); row++) {
         WildPokemon newWildMon;
-        newWildMon.species = monTable->cellWidget(row, 1)->findChild<QComboBox *>()->currentText();
-        newWildMon.minLevel = monTable->cellWidget(row, 2)->findChild<QSpinBox *>()->value();
-        newWildMon.maxLevel = monTable->cellWidget(row, 3)->findChild<QSpinBox *>()->value();
+        newWildMon.species = monTable->cellWidget(row, extraColumn ? 2 : 1)->findChild<QComboBox *>()->currentText();
+        newWildMon.minLevel = monTable->cellWidget(row, extraColumn ? 3 : 2)->findChild<QSpinBox *>()->value();
+        newWildMon.maxLevel = monTable->cellWidget(row, extraColumn ? 4 : 3)->findChild<QSpinBox *>()->value();
         newWildMons.append(newWildMon);
     }
     newInfo.active = true;
diff --git a/src/editor.cpp b/src/editor.cpp
index 86edb18d..3907e6bf 100644
--- a/src/editor.cpp
+++ b/src/editor.cpp
@@ -188,8 +188,8 @@ void Editor::displayWildMonTables() {
         stack->insertWidget(labelIndex, tabWidget);
 
         int tabIndex = 0;
-        for (Field monField : project->wildMonFields) {
-            QString fieldName = monField.first;
+        for (EncounterField monField : project->wildMonFields) {
+            QString fieldName = monField.name;
 
             tabWidget->clearTableAt(tabIndex);
 
@@ -245,24 +245,24 @@ void Editor::addNewWildMonGroup(QWidget *window) {
     copyCheckbox->setEnabled(stack->count());
     form.addRow(new QLabel("Copy from current group"), copyCheckbox);
     QVector<QCheckBox *> fieldCheckboxes;
-    for (Field monField : project->wildMonFields) {
+    for (EncounterField monField : project->wildMonFields) {
         QCheckBox *fieldCheckbox = new QCheckBox;
         fieldCheckboxes.append(fieldCheckbox);
-        form.addRow(new QLabel(monField.first), fieldCheckbox);
+        form.addRow(new QLabel(monField.name), fieldCheckbox);
     }
     // Reading from ui here so not saving to disk before user.
     connect(copyCheckbox, &QCheckBox::stateChanged, [=](int state){
         if (state == Qt::Checked) {
             int fieldIndex = 0;
             MonTabWidget *monWidget = static_cast<MonTabWidget *>(stack->widget(stack->currentIndex()));
-            for (Field monField : project->wildMonFields) {
+            for (EncounterField monField : project->wildMonFields) {
                 fieldCheckboxes[fieldIndex]->setChecked(monWidget->isTabEnabled(fieldIndex));
                 fieldCheckboxes[fieldIndex]->setEnabled(false);
                 fieldIndex++;
             }
         } else if (state == Qt::Unchecked) {
             int fieldIndex = 0;
-            for (Field monField : project->wildMonFields) {
+            for (EncounterField monField : project->wildMonFields) {
                 fieldCheckboxes[fieldIndex]->setEnabled(true);
                 fieldIndex++;
             }
@@ -281,8 +281,8 @@ void Editor::addNewWildMonGroup(QWidget *window) {
 
     if (dialog.exec() == QDialog::Accepted) {
         WildPokemonHeader header;
-        for (Field monField : project->wildMonFields) {
-            QString fieldName = monField.first;
+        for (EncounterField monField : project->wildMonFields) {
+            QString fieldName = monField.name;
             header.wildMons[fieldName].active = false;
             header.wildMons[fieldName].encounterRate = 0;
         }
@@ -294,14 +294,14 @@ void Editor::addNewWildMonGroup(QWidget *window) {
         labelCombo->setCurrentIndex(labelCombo->count() - 1);
 
         int tabIndex = 0;
-        for (Field monField : project->wildMonFields) {
-            QString fieldName = monField.first;
+        for (EncounterField monField : project->wildMonFields) {
+            QString fieldName = monField.name;
             tabWidget->clearTableAt(tabIndex);
             if (fieldCheckboxes[tabIndex]->isChecked()) {
                 if (copyCheckbox->isChecked()) {
                     MonTabWidget *copyFrom = static_cast<MonTabWidget *>(stack->widget(stackIndex));
                     if (copyFrom->isTabEnabled(tabIndex))
-                        header.wildMons.insert(fieldName, copyMonInfoFromTab(copyFrom->tableAt(tabIndex)));
+                        header.wildMons.insert(fieldName, copyMonInfoFromTab(copyFrom->tableAt(tabIndex), monField));
                     else
                         header.wildMons.insert(fieldName, getDefaultMonInfo(monField));
                 } else {
@@ -319,25 +319,52 @@ void Editor::addNewWildMonGroup(QWidget *window) {
 void Editor::configureEncounterJSON(QWidget *window) {
     QVector<QWidget *> fieldSlots;
 
-    Fields tempFields = project->wildMonFields;
+    EncounterFields tempFields = project->wildMonFields;
 
     QLabel *totalLabel = new QLabel;
 
-    auto updateTotal = [&fieldSlots, totalLabel](Field &currentField) {
+    // lambda: Update the total displayed at the bottom of the Configure JSON
+    //         window. Take groups into account when applicable.
+    auto updateTotal = [&fieldSlots, totalLabel](EncounterField &currentField) {
         int total = 0, spinnerIndex = 0;
+        QString groupTotalMessage;
+        QMap<QString, int> groupTotals;
+        for (QString key : currentField.groups.keys())
+            groupTotals.insert(key, 0);// add to group map and initialize total to zero
         for (auto slot : fieldSlots) {
             QSpinBox *spinner = slot->findChild<QSpinBox *>();
             int val = spinner->value();
-            currentField.second[spinnerIndex++] = spinner->value();
-            total += val;
+            currentField.encounterRates[spinnerIndex] = val;
+            if (!currentField.groups.isEmpty()) {
+                for (QString key : currentField.groups.keys()) {
+                    if (currentField.groups[key].contains(spinnerIndex)) {
+                        groupTotals[key] += val;
+                        break;
+                    }
+                }
+            } else {
+                total += val;
+            }
+            spinnerIndex++;
+        }
+        if (!currentField.groups.isEmpty()) {
+            groupTotalMessage += "Totals: ";
+            for (QString key : currentField.groups.keys()) {
+                groupTotalMessage += QString("%1 (%2),\t").arg(groupTotals[key]).arg(key);
+            }
+            groupTotalMessage.chop(2);
+            totalLabel->setText(groupTotalMessage);
+        } else {
+            totalLabel->setText(QString("Total: %1").arg(QString::number(total)));
         }
-        totalLabel->setText(QString("Total: %1").arg(QString::number(total)));
     };
 
-    auto createNewSlot = [&fieldSlots, &updateTotal](int index, Field &currentField) {
+    // lambda: Create a new "slot", which is the widget containing a spinner and an index label. 
+    //         Add the slot to a list of fieldSlots, which exists to keep track of them for memory management.
+    auto createNewSlot = [&fieldSlots, &tempFields, &updateTotal](int index, EncounterField &currentField) {
         QLabel *indexLabel = new QLabel(QString("Index: %1").arg(QString::number(index)));
         QSpinBox *chanceSpinner = new QSpinBox;
-        int chance = currentField.second.at(index);
+        int chance = currentField.encounterRates.at(index);
         chanceSpinner->setMinimum(1);
         chanceSpinner->setMaximum(9999);
         chanceSpinner->setValue(chance);
@@ -345,11 +372,46 @@ void Editor::configureEncounterJSON(QWidget *window) {
             updateTotal(currentField);
         });
 
+        bool useGroups = !currentField.groups.isEmpty();
+
+        QFrame *slotChoiceFrame = new QFrame;
+        QVBoxLayout *slotChoiceLayout = new QVBoxLayout;
+        if (useGroups) {
+            QComboBox *groupCombo = new QComboBox;
+            connect(groupCombo, QOverload<const QString &>::of(&QComboBox::activated), [&tempFields, &currentField, index](QString newGroupName) {
+                for (EncounterField &field : tempFields) {
+                    if (field.name == currentField.name) {
+                        for (QString groupName : field.groups.keys()) {
+                            if (field.groups[groupName].contains(index)) {
+                                field.groups[groupName].removeAll(index);
+                                break;
+                            }
+                        }
+                        for (QString groupName : field.groups.keys()) {
+                            if (groupName == newGroupName) field.groups[newGroupName].append(index);
+                        }
+                        break;
+                    }
+                }
+            });
+            groupCombo->addItems(currentField.groups.keys());
+            QString currentGroupName;
+            for (QString groupName : currentField.groups.keys()) {
+                if (currentField.groups[groupName].contains(index)) {
+                    currentGroupName = groupName;
+                    break;
+                }
+            }
+            groupCombo->setCurrentText(currentGroupName);
+            slotChoiceLayout->addWidget(groupCombo);
+        }
+        slotChoiceLayout->addWidget(chanceSpinner);
+        slotChoiceFrame->setLayout(slotChoiceLayout);
+
         QFrame *slot = new QFrame;
         QHBoxLayout *slotLayout = new QHBoxLayout;
-        slotLayout->addStretch();
         slotLayout->addWidget(indexLabel);
-        slotLayout->addWidget(chanceSpinner);
+        slotLayout->addWidget(slotChoiceFrame);
         slot->setLayout(slotLayout);
 
         fieldSlots.append(slot);
@@ -368,13 +430,16 @@ void Editor::configureEncounterJSON(QWidget *window) {
     connect(&buttonBox, SIGNAL(accepted()), &dialog, SLOT(accept()));
     connect(&buttonBox, SIGNAL(rejected()), &dialog, SLOT(reject()));
 
+    // lambda: Get a QStringList of the existing field names.
     auto getFieldNames = [&tempFields]() {
         QStringList fieldNames;
-        for (Field field : tempFields)
-            fieldNames.append(field.first);
+        for (EncounterField field : tempFields)
+            fieldNames.append(field.name);
         return fieldNames;
     };
-    auto drawSlotWidgets = [this, &grid, &createNewSlot, &fieldSlots, &updateTotal, &tempFields](int index) {
+
+    // lambda: Draws the slot widgets onto a grid (4 wide) on the dialog window.
+    auto drawSlotWidgets = [this, &dialog, &grid, &createNewSlot, &fieldSlots, &updateTotal, &tempFields](int index) {
         // Clear them first.
         while (!fieldSlots.isEmpty()) {
             auto slot = fieldSlots.takeFirst();
@@ -382,12 +447,14 @@ void Editor::configureEncounterJSON(QWidget *window) {
             delete slot;
         }
 
-        Field &currentField = tempFields[index];
-        for (int i = 0; i < currentField.second.size(); i++) {
+        EncounterField &currentField = tempFields[index];
+        for (int i = 0; i < currentField.encounterRates.size(); i++) {
             grid.addWidget(createNewSlot(i, currentField), i / 4 + 1, i % 4);
         }
 
         updateTotal(currentField);
+
+        dialog.adjustSize();// TODO: why is this updating only on second call? reproduce: land->fishing->rock_smash->water
     };
     QComboBox *fieldChoices = new QComboBox;
     connect(fieldChoices, QOverload<int>::of(&QComboBox::currentIndexChanged), drawSlotWidgets);
@@ -414,7 +481,7 @@ void Editor::configureEncounterJSON(QWidget *window) {
         if (newNameDialog.exec() == QDialog::Accepted) {
             QString newFieldName = newNameEdit->text();
             QVector<int> newFieldRates(1, 100);
-            tempFields.append({newFieldName, newFieldRates});
+            tempFields.append({newFieldName, newFieldRates, {}});
             fieldChoices->addItem(newFieldName);
             fieldChoices->setCurrentIndex(fieldChoices->count() - 1);
         }
@@ -431,16 +498,16 @@ void Editor::configureEncounterJSON(QWidget *window) {
     QPushButton *addSlotButton = new QPushButton(QIcon(":/icons/add.ico"), "");
     addSlotButton->setFlat(true);
     connect(addSlotButton, &QPushButton::clicked, [this, &fieldChoices, &drawSlotWidgets, &tempFields]() {
-        Field &field = tempFields[fieldChoices->currentIndex()];
-        field.second.append(1);
+        EncounterField &field = tempFields[fieldChoices->currentIndex()];
+        field.encounterRates.append(1);
         drawSlotWidgets(fieldChoices->currentIndex());
     });
     QPushButton *removeSlotButton = new QPushButton(QIcon(":/icons/delete.ico"), "");
     removeSlotButton->setFlat(true);
     connect(removeSlotButton, &QPushButton::clicked, [this, &fieldChoices, &drawSlotWidgets, &tempFields]() {
-        Field &field = tempFields[fieldChoices->currentIndex()];
-        if (field.second.size() > 1)
-            field.second.removeLast();
+        EncounterField &field = tempFields[fieldChoices->currentIndex()];
+        if (field.encounterRates.size() > 1)
+            field.encounterRates.removeLast();
         drawSlotWidgets(fieldChoices->currentIndex());
     });
 
@@ -490,39 +557,39 @@ void Editor::saveEncounterTabData() {
         WildPokemonHeader &encounterHeader = encounterMap[labelCombo->itemText(groupIndex)];
 
         int fieldIndex = 0;
-        for (Field monField : project->wildMonFields) {
-            QString fieldName = monField.first;
+        for (EncounterField monField : project->wildMonFields) {
+            QString fieldName = monField.name;
 
             if (!tabWidget->isTabEnabled(fieldIndex++)) continue;
 
             QTableWidget *monTable = static_cast<QTableWidget *>(tabWidget->widget(fieldIndex - 1));
             QVector<WildPokemon> newWildMons;
-            encounterHeader.wildMons[fieldName] = copyMonInfoFromTab(monTable);
+            encounterHeader.wildMons[fieldName] = copyMonInfoFromTab(monTable, monField);
         }
     }
 }
 
 // Update encounters for every map based on the new encounter JSON field data.
-void Editor::updateEncounterFields(Fields newFields) {
-    Fields oldFields = project->wildMonFields;
+void Editor::updateEncounterFields(EncounterFields newFields) {
+    EncounterFields oldFields = project->wildMonFields;
     // Go through fields and determine whether we need to update a field.
     // If the field is new, do nothing.
     // If the field is deleted, remove from all maps.
     // If the field is changed, change all maps accordingly.
-    for (Field oldField : oldFields) {
-        QString oldFieldName = oldField.first;
+    for (EncounterField oldField : oldFields) {
+        QString oldFieldName = oldField.name;
         bool fieldDeleted = true;
-        for (Field newField : newFields) {
-            QString newFieldName = newField.first;
+        for (EncounterField newField : newFields) {
+            QString newFieldName = newField.name;
             if (oldFieldName == newFieldName) {
                 fieldDeleted = false;
-                if (oldField.second.size() != newField.second.size()) {
+                if (oldField.encounterRates.size() != newField.encounterRates.size()) {
                     for (QString map : project->wildMonData.keys()) {
                         for (QString groupName : project->wildMonData.value(map).keys()) {
                             WildPokemonHeader &monHeader = project->wildMonData[map][groupName];
                             for (QString fieldName : monHeader.wildMons.keys()) {
                                 if (fieldName == oldFieldName) {
-                                    monHeader.wildMons[fieldName].wildPokemon.resize(newField.second.size());
+                                    monHeader.wildMons[fieldName].wildPokemon.resize(newField.encounterRates.size());
                                 }
                             }
                         }
diff --git a/src/project.cpp b/src/project.cpp
index cc12f15f..45e1c8a0 100644
--- a/src/project.cpp
+++ b/src/project.cpp
@@ -539,16 +539,27 @@ void Project::saveWildMonData() {
     monHeadersObject["for_maps"] = true;
 
     QJsonArray fieldsInfoArray;
-    for (QPair<QString, QVector<int>> fieldInfo : wildMonFields) {
+    for (EncounterField fieldInfo : wildMonFields) {
         QJsonObject fieldObject;
         QJsonArray rateArray;
 
-        for (int rate : fieldInfo.second)
+        for (int rate : fieldInfo.encounterRates) {
             rateArray.append(rate);
+        }
 
-        fieldObject["type"] = fieldInfo.first;
+        fieldObject["type"] = fieldInfo.name;
         fieldObject["encounter_rates"] = rateArray;
 
+        QJsonObject groupsObject;
+        for (QString groupName : fieldInfo.groups.keys()) {
+            QJsonArray subGroupIndices;
+            for (int slotIndex : fieldInfo.groups[groupName]) {
+                subGroupIndices.append(slotIndex);
+            }
+            groupsObject[groupName] = subGroupIndices;
+        }
+        fieldObject["groups"] = groupsObject;
+
         fieldsInfoArray.append(fieldObject);
     }
     monHeadersObject["fields"] = fieldsInfoArray;
@@ -1399,10 +1410,16 @@ void Project::readWildMonData() {
         }
 
         for (auto field : subObject["fields"].toArray()) {
-            QPair<QString, QVector<int>> encounterField;
-            encounterField.first = field.toObject()["type"].toString();
-            for (auto val : field.toObject()["encounter_rates"].toArray())
-                encounterField.second.append(val.toInt());
+            EncounterField encounterField;
+            encounterField.name = field.toObject()["type"].toString();
+            for (auto val : field.toObject()["encounter_rates"].toArray()) {
+                encounterField.encounterRates.append(val.toInt());
+            }
+            for (QString group : field.toObject()["groups"].toObject().keys()) {
+                for (auto slotNum : field.toObject()["groups"].toObject()[group].toArray()) {
+                    encounterField.groups[group].append(slotNum.toInt());
+                }
+            }
             wildMonFields.append(encounterField);
         }
 
@@ -1412,8 +1429,8 @@ void Project::readWildMonData() {
 
             WildPokemonHeader header;
 
-            for (QPair<QString, QVector<int>> monField : wildMonFields) {
-                QString field = monField.first;
+            for (EncounterField monField : wildMonFields) {
+                QString field = monField.name;
                 if (encounter.toObject().value(field) != QJsonValue::Undefined) {
                     header.wildMons[field].active = true;
                     header.wildMons[field].encounterRate = encounter.toObject().value(field).toObject().value("encounter_rate").toInt();
diff --git a/src/ui/montabwidget.cpp b/src/ui/montabwidget.cpp
index 6838f32e..0ef30a08 100644
--- a/src/ui/montabwidget.cpp
+++ b/src/ui/montabwidget.cpp
@@ -22,16 +22,16 @@ bool MonTabWidget::eventFilter(QObject *, QEvent *event) {
 }
 
 void MonTabWidget::populate() {
-    Fields fields = project->wildMonFields;
+    EncounterFields fields = project->wildMonFields;
     activeTabs = QVector<bool>(fields.size(), false);
 
-    for (QPair<QString, QVector<int>> field : fields) {
+    for (EncounterField field : fields) {
         QTableWidget *table = new QTableWidget;
         table->setEditTriggers(QAbstractItemView::NoEditTriggers);
         table->setFocusPolicy(Qt::NoFocus);
         table->setSelectionMode(QAbstractItemView::NoSelection);
         table->clearFocus();
-        addTab(table, field.first);
+        addTab(table, field.name);
     }
 }
 
@@ -62,11 +62,21 @@ void MonTabWidget::clearTableAt(int tabIndex) {
 void MonTabWidget::populateTab(int tabIndex, WildMonInfo monInfo, QString fieldName) {
     QTableWidget *speciesTable = tableAt(tabIndex);
 
+    int fieldIndex = 0;
+    for (EncounterField field : project->wildMonFields) {
+        if (field.name == fieldName) break;
+        fieldIndex++;
+    }
+    bool insertGroupLabel = false;
+    if (!project->wildMonFields[fieldIndex].groups.isEmpty()) insertGroupLabel = true;
+
     speciesTable->setRowCount(monInfo.wildPokemon.size());
-    speciesTable->setColumnCount(7);
+    speciesTable->setColumnCount(insertGroupLabel ? 8 : 7);
 
     QStringList landMonTableHeaders;
-    landMonTableHeaders << "Slot" << "Species" << "Min Level" << "Max Level" 
+    landMonTableHeaders << "Slot";
+    if (insertGroupLabel) landMonTableHeaders << "Group";
+    landMonTableHeaders << "Species" << "Min Level" << "Max Level" 
                         << "Encounter Chance" << "Slot Ratio" << "Encounter Rate";
     speciesTable->setHorizontalHeaderLabels(landMonTableHeaders);
     speciesTable->horizontalHeader()->show();
@@ -85,7 +95,7 @@ void MonTabWidget::populateTab(int tabIndex, WildMonInfo monInfo, QString fieldN
     encounterRate->setValue(monInfo.encounterRate);
     encounterLayout->addWidget(encounterRate);
     encounterFrame->setLayout(encounterLayout);
-    speciesTable->setCellWidget(0, 6, encounterFrame);
+    speciesTable->setCellWidget(0, insertGroupLabel? 7 : 6, encounterFrame);
 
     int i = 0;
     for (WildPokemon mon : monInfo.wildPokemon) {
@@ -127,19 +137,32 @@ void MonTabWidget::createSpeciesTableRow(QTableWidget *table, WildPokemon mon, i
     });
 
     int fieldIndex = 0;
-    for (auto field : project->wildMonFields) {
-        if (field.first == fieldName) break;
+    for (EncounterField field : project->wildMonFields) {
+        if (field.name == fieldName) break;
         fieldIndex++;
     }
-    double slotChanceTotal = 0;
-    for (auto chance : project->wildMonFields[fieldIndex].second) {
-        slotChanceTotal += static_cast<double>(chance);
+
+    double slotChanceTotal = 0.0;
+    if (!project->wildMonFields[fieldIndex].groups.isEmpty()) {
+        for (QString groupKey : project->wildMonFields[fieldIndex].groups.keys()) {
+            if (project->wildMonFields[fieldIndex].groups[groupKey].contains(index)) {
+                for (int chanceIndex : project->wildMonFields[fieldIndex].groups[groupKey]) {
+                    slotChanceTotal += static_cast<double>(project->wildMonFields[fieldIndex].encounterRates[chanceIndex]);
+                }
+                break;
+            }
+        }
+    } else {
+        for (auto chance : project->wildMonFields[fieldIndex].encounterRates) {
+            slotChanceTotal += static_cast<double>(chance);
+        }
     }
+    
     QLabel *percentLabel = new QLabel(QString("%1%").arg(
-        QString::number(project->wildMonFields[fieldIndex].second[index] / slotChanceTotal * 100.0, 'f', 2)
+        QString::number(project->wildMonFields[fieldIndex].encounterRates[index] / slotChanceTotal * 100.0, 'f', 2)
     ));
     QLabel *ratioLabel = new QLabel(QString("%1").arg(
-        QString::number(project->wildMonFields[fieldIndex].second[index]
+        QString::number(project->wildMonFields[fieldIndex].encounterRates[index]
     )));
 
     QFrame *speciesSelector = new QFrame;
@@ -158,12 +181,25 @@ void MonTabWidget::createSpeciesTableRow(QTableWidget *table, WildPokemon mon, i
     maxLevelSpinboxLayout->addWidget(maxLevel);
     maxLevelFrame->setLayout(maxLevelSpinboxLayout);
 
+    bool insertGroupLabel = false;
+    if (!project->wildMonFields[fieldIndex].groups.isEmpty()) insertGroupLabel = true;
     table->setCellWidget(index, 0, monNum);
-    table->setCellWidget(index, 1, speciesSelector);
-    table->setCellWidget(index, 2, minLevelFrame);
-    table->setCellWidget(index, 3, maxLevelFrame);
-    table->setCellWidget(index, 4, percentLabel);
-    table->setCellWidget(index, 5, ratioLabel);
+    if (insertGroupLabel) {
+        QString groupName = QString();
+        for (QString groupKey : project->wildMonFields[fieldIndex].groups.keys()) {
+            if (project->wildMonFields[fieldIndex].groups[groupKey].contains(index)) {
+                groupName = groupKey;
+                break;
+            }
+        }
+        QLabel *groupNameLabel = new QLabel(groupName);
+        table->setCellWidget(index, 1, groupNameLabel);
+    }
+    table->setCellWidget(index, insertGroupLabel? 2 : 1, speciesSelector);
+    table->setCellWidget(index, insertGroupLabel? 3 : 2, minLevelFrame);
+    table->setCellWidget(index, insertGroupLabel? 4 : 3, maxLevelFrame);
+    table->setCellWidget(index, insertGroupLabel? 5 : 4, percentLabel);
+    table->setCellWidget(index, insertGroupLabel? 6 : 5, ratioLabel);
 }
 
 QTableWidget *MonTabWidget::tableAt(int tabIndex) {