diff --git a/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/EditBooleanMapModal.vue b/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/EditBooleanMapModal.vue
index 2cbdded597..d949cc576b 100644
--- a/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/EditBooleanMapModal.vue
+++ b/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/EditBooleanMapModal.vue
@@ -1,10 +1,8 @@
-
 <template>
 
   <KModal
     :title="title"
     :submitText="$tr('saveAction')"
-    :submitDisabled="!canSave"
     :cancelText="$tr('cancelAction')"
     data-test="edit-booleanMap-modal"
     @submit="handleSave"
@@ -13,9 +11,6 @@
     <p v-if="resourcesSelectedText.length > 0" data-test="resources-selected-message">
       {{ resourcesSelectedText }}
     </p>
-    <p v-if="hasMixedCategories" data-test="mixed-categories-message">
-      {{ hasMixedCategoriesMessage }}
-    </p>
     <template v-if="isDescendantsUpdatable && isTopicSelected">
       <KCheckbox
         :checked="updateDescendants"
@@ -31,6 +26,9 @@
       :inputHandler="(value) => { selectedValues = value }"
     ></slot>
 
+    <span v-if="error" class="red--text">
+      {{ error }}
+    </span>
   </KModal>
 
 </template>
@@ -47,7 +45,6 @@
   import { mapGetters, mapActions } from 'vuex';
   import { ContentKindsNames } from 'shared/leUtils/ContentKinds';
   import { getInvalidText } from 'shared/utils/validation';
-  import commonStrings from 'shared/translator';
 
   export default {
     name: 'EditBooleanMapModal',
@@ -97,31 +94,13 @@
       };
     },
     computed: {
-      ...mapGetters('contentNode', ['getContentNodes', 'getContentNode']),
+      ...mapGetters('contentNode', ['getContentNodes']),
       nodes() {
         return this.getContentNodes(this.nodeIds);
       },
       isTopicSelected() {
         return this.nodes.some(node => node.kind === ContentKindsNames.TOPIC);
       },
-      canSave() {
-        return Object.values(this.selectedValues).some(value => value.length > 0);
-      },
-      hasMixedCategories() {
-        const allSelectedCategories = new Set(Object.keys(this.selectedValues));
-        for (const categoryId of allSelectedCategories) {
-          const nodesWithThisCategory = this.selectedValues[categoryId].length;
-
-          if (nodesWithThisCategory < this.nodes.length) {
-            return true;
-          }
-        }
-        return false;
-      },
-      hasMixedCategoriesMessage() {
-        // eslint-disable-next-line kolibri/vue-no-undefined-string-uses
-        return commonStrings.$tr('addAdditionalCatgoriesDescription');
-      },
     },
     watch: {
       selectedValues(newValue, oldValue) {
@@ -168,16 +147,19 @@
         }
       },
       async handleSave() {
+        this.validate();
+        if (this.error) {
+          return;
+        }
+
         await Promise.all(
-          this.nodes.map(async node => {
+          this.nodes.map(node => {
             const fieldValue = {};
-            const currentNode = this.getContentNode(node.id);
-
             Object.entries(this.selectedValues).forEach(([key, value]) => {
-              const existingValue = currentNode[this.field]?.[key] || false;
-              fieldValue[key] = existingValue || value.includes(node.id);
+              if (value.includes(node.id)) {
+                fieldValue[key] = true;
+              }
             });
-
             if (this.updateDescendants && node.kind === ContentKindsNames.TOPIC) {
               return this.updateContentNodeDescendants({
                 id: node.id,
diff --git a/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/__tests__/EditBooleanMapModal.spec.js b/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/__tests__/EditBooleanMapModal.spec.js
index 428d41cad1..e8a48355e1 100644
--- a/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/__tests__/EditBooleanMapModal.spec.js
+++ b/contentcuration/contentcuration/frontend/channelEdit/components/QuickEditModal/__tests__/EditBooleanMapModal.spec.js
@@ -16,6 +16,7 @@ let generalActions;
 const CheckboxValue = {
   UNCHECKED: 'UNCHECKED',
   CHECKED: 'CHECKED',
+  INDETERMINATE: 'INDETERMINATE',
 };
 
 const { translateMetadataString } = metadataTranslationMixin.methods;
@@ -30,9 +31,11 @@ const getOptionsValues = wrapper => {
   const categories = {};
   const checkboxes = wrapper.findAll('[data-test="option-checkbox"]');
   checkboxes.wrappers.forEach(checkbox => {
-    const { label, checked } = checkbox.vm.$props || {};
+    const { label, checked, indeterminate } = checkbox.vm.$props || {};
     let value;
-    if (checked) {
+    if (indeterminate) {
+      value = CheckboxValue.INDETERMINATE;
+    } else if (checked) {
       value = CheckboxValue.CHECKED;
     } else {
       value = CheckboxValue.UNCHECKED;
@@ -179,6 +182,26 @@ describe('EditBooleanMapModal', () => {
         expect(dailyLifeValue).toBe(CheckboxValue.CHECKED);
         expect(foundationsValue).toBe(CheckboxValue.CHECKED);
       });
+
+      test('checkbox option should be indeterminate if not all nodes have the same options set', () => {
+        nodes['node1'].categories = {
+          [Categories.DAILY_LIFE]: true,
+          [Categories.FOUNDATIONS]: true,
+        };
+        nodes['node2'].categories = {
+          [Categories.DAILY_LIFE]: true,
+        };
+
+        const wrapper = makeWrapper({ nodeIds: ['node1', 'node2'] });
+
+        const optionsValues = getOptionsValues(wrapper);
+        const {
+          [Categories.DAILY_LIFE]: dailyLifeValue,
+          [Categories.FOUNDATIONS]: foundationsValue,
+        } = optionsValues;
+        expect(dailyLifeValue).toBe(CheckboxValue.CHECKED);
+        expect(foundationsValue).toBe(CheckboxValue.INDETERMINATE);
+      });
     });
   });
 
diff --git a/contentcuration/contentcuration/frontend/shared/views/contentNodeFields/CategoryOptions.vue b/contentcuration/contentcuration/frontend/shared/views/contentNodeFields/CategoryOptions.vue
index f6170a8b9a..032a720873 100644
--- a/contentcuration/contentcuration/frontend/shared/views/contentNodeFields/CategoryOptions.vue
+++ b/contentcuration/contentcuration/frontend/shared/views/contentNodeFields/CategoryOptions.vue
@@ -5,7 +5,7 @@
       <template #default="{ attach, menuProps }">
         <VAutocomplete
           :value="autocompleteValues"
-          :items="categoriesList"
+          :items="autocompleteOptions"
           :searchInput.sync="categoryText"
           :label="translateMetadataString('category')"
           box
@@ -81,6 +81,7 @@
         :label="option.text"
         :style="treeItemStyle(option)"
         :checked="isSelected(option.value)"
+        :indeterminate="isCheckboxIndeterminate(option.value)"
         @change="onChange(option.value)"
       />
       <p
@@ -101,6 +102,8 @@
   import DropdownWrapper from 'shared/views/form/DropdownWrapper';
   import { constantsTranslationMixin, metadataTranslationMixin } from 'shared/mixins';
 
+  const MIXED = 'mixed';
+
   export default {
     name: 'CategoryOptions',
     components: { DropdownWrapper },
@@ -152,10 +155,28 @@
           this.$emit('input', value);
         },
       },
+      autocompleteOptions() {
+        const options = [...this.categoriesList];
+        if (this.expanded) {
+          // Just boolean maps can have indeterminate values
+          options.push({
+            value: MIXED,
+            text: this.$tr('mixedLabel'),
+            undeletable: true,
+          });
+        }
+        return options;
+      },
       autocompleteValues() {
         const selectedValues = Object.entries(this.selected)
           .filter(entry => entry[1].length === this.nodeIds.length)
           .map(([key]) => key);
+        if (
+          this.expanded &&
+          Object.values(this.selected).some(value => value.length < this.nodeIds.length)
+        ) {
+          selectedValues.push(MIXED);
+        }
         return selectedValues;
       },
       nested() {
@@ -195,6 +216,9 @@
         this.selected = {};
       },
       tooltipText(optionId) {
+        if (optionId === MIXED) {
+          return this.$tr('mixedLabel');
+        }
         const option = this.categoriesList.find(option => option.value === optionId);
         if (!option) {
           return '';
@@ -258,6 +282,15 @@
         });
         return nodeIds.size === this.nodeIds.length;
       },
+      isCheckboxIndeterminate(optionId) {
+        if (this.selected[optionId] && this.selected[optionId].length < this.nodeIds.length) {
+          return true;
+        }
+        return (
+          Object.keys(this.selected).some(selectedValue => selectedValue.startsWith(optionId)) &&
+          !this.isSelected(optionId)
+        );
+      },
       onChange(optionId) {
         if (this.isSelected(optionId)) {
           this.remove(optionId);
@@ -268,6 +301,7 @@
     },
     $trs: {
       noCategoryFoundText: 'Category not found',
+      mixedLabel: 'Mixed',
     },
   };
 
diff --git a/contentcuration/contentcuration/frontend/shared/views/form/ExpandableSelect.vue b/contentcuration/contentcuration/frontend/shared/views/form/ExpandableSelect.vue
index cdeea8ee22..127eeabd7a 100644
--- a/contentcuration/contentcuration/frontend/shared/views/form/ExpandableSelect.vue
+++ b/contentcuration/contentcuration/frontend/shared/views/form/ExpandableSelect.vue
@@ -50,6 +50,7 @@
           :key="option.value"
           :label="option.text"
           :checked="isSelected(option.value)"
+          :indeterminate="isIndeterminate(option.value)"
           data-test="option-checkbox"
           @change="value => setOption(option.value, value)"
         />
@@ -187,6 +188,12 @@
         }
         return this.valueModel[value].length === this.availableItems.length;
       },
+      isIndeterminate(value) {
+        if (!this.valueModel[value]) {
+          return false;
+        }
+        return this.valueModel[value].length < this.availableItems.length;
+      },
       setOption(optionId, value) {
         if (value) {
           this.valueModel = {
@@ -209,4 +216,4 @@
     pointer-events: none;
     opacity: 0.5;
   }
-</style>
+</style>
\ No newline at end of file