diff --git a/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2m.vue b/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2m.vue
index e02040b447..1e82e1106e 100644
--- a/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2m.vue
+++ b/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2m.vue
@@ -13,6 +13,7 @@
 					v-model="junctionCollection"
 					:placeholder="$t('select_one')"
 					:disabled="isExisting"
+					allow-other
 				/>
 			</div>
 			<div class="field">
@@ -111,7 +112,7 @@ export default defineComponent({
 				value: field.field,
 				disabled:
 					state.relations[0].many_field === field.field ||
-					field.schema?.is_primary_key || 
+					field.schema?.is_primary_key ||
 					state.relations[1].many_field === field.field,
 			}));
 		});
diff --git a/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2o.vue b/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2o.vue
index b894e02238..b4ca1aaad5 100644
--- a/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2o.vue
+++ b/app/src/modules/settings/routes/data-model/field-detail/components/relationship-m2o.vue
@@ -8,16 +8,32 @@
 			</div>
 			<div class="field">
 				<div class="type-label">{{ $t('related_collection') }}</div>
-				<v-select
-					:placeholder="$t('select_one')"
-					:items="items"
-					v-model="relations[0].one_collection"
-					:disabled="isExisting"
-				/>
+				<v-input db-safe key="related-collection" v-model="relations[0].one_collection" :disabled="isExisting" :placeholder="$t('collection')">
+					<template #append>
+						<v-menu show-arrow placement="bottom-end">
+							<template #activator="{ toggle }">
+								<v-icon name="box" @click="toggle" v-tooltip="$t('select_existing')" />
+							</template>
+
+							<v-list dense class="monospace">
+								<v-list-item
+									v-for="item in items"
+									:key="item.value"
+									:active="relations[0].one_collection === item.value"
+									@click="relations[0].one_collection = item.value"
+								>
+									<v-list-item-content>
+										{{ item.text }}
+									</v-list-item-content>
+								</v-list-item>
+							</v-list>
+						</v-menu>
+					</template>
+				</v-input>
 			</div>
-			<v-input disabled :value="fieldData.field" />
-			<v-input disabled :value="relatedPrimary" />
-			<v-icon name="arrow_back" />
+			<v-input disabled :value="relations[0].many_field" />
+			<v-input db-safe :disabled="isNewCollection === false" v-model="relations[0].one_primary" :placeholder="$t('primary_key')" />
+			<v-icon class="arrow" name="arrow_back" />
 		</div>
 
 		<v-divider v-if="!isExisting" />
@@ -31,7 +47,7 @@
 				<div class="type-label">{{ $t('corresponding_field_name') }}</div>
 				<v-input :disabled="hasCorresponding === false" v-model="correspondingField" db-safe />
 			</div>
-			<v-icon name="arrow_forward" />
+			<v-icon name="arrow_forward" class="arrow" />
 		</div>
 	</div>
 </template>
@@ -66,17 +82,21 @@ export default defineComponent({
 		const collectionsStore = useCollectionsStore();
 		const fieldsStore = useFieldsStore();
 
-		const { items, relatedPrimary } = useRelation();
+		const { items } = useRelation();
 		const { hasCorresponding, correspondingField, correspondingLabel } = useCorresponding();
 
+		const isNewCollection = computed(() => {
+			return collectionsStore.getCollection(state.relations[0].one_collection) === null;
+		});
+
 		return {
 			relations: state.relations,
 			items,
-			relatedPrimary,
 			hasCorresponding,
 			correspondingField,
 			correspondingLabel,
 			fieldData: state.fieldData,
+			isNewCollection,
 		};
 
 		function useRelation() {
@@ -97,13 +117,7 @@ export default defineComponent({
 				}))
 			);
 
-			const relatedPrimary = computed(() => {
-				return state.relations[0].one_collection
-					? fieldsStore.getPrimaryKeyFieldForCollection(state.relations[0].one_collection)?.field
-					: null;
-			});
-
-			return { items, relatedPrimary };
+			return { items };
 		}
 
 		function useCorresponding() {
@@ -175,7 +189,7 @@ export default defineComponent({
 	gap: 20px 32px;
 	margin-top: 48px;
 
-	.v-icon {
+	.arrow {
 		--v-icon-color: var(--foreground-subdued);
 
 		position: absolute;
@@ -185,6 +199,10 @@ export default defineComponent({
 	}
 }
 
+.v-list {
+	--v-list-item-content-font-family: var(--family-monospace);
+}
+
 .v-divider {
 	margin: 48px 0;
 }
diff --git a/app/src/modules/settings/routes/data-model/field-detail/field-detail.vue b/app/src/modules/settings/routes/data-model/field-detail/field-detail.vue
index e3ea5445b6..b6c5bc1a40 100644
--- a/app/src/modules/settings/routes/data-model/field-detail/field-detail.vue
+++ b/app/src/modules/settings/routes/data-model/field-detail/field-detail.vue
@@ -66,8 +66,8 @@ import SetupDisplay from './components/display.vue';
 import { i18n } from '@/lang';
 import { isEmpty } from 'lodash';
 import api from '@/api';
-import { Relation } from '@/types';
-import { useFieldsStore, useRelationsStore } from '@/stores/';
+import { Relation, Collection } from '@/types';
+import { useFieldsStore, useRelationsStore, useCollectionsStore } from '@/stores/';
 import { Field } from '@/types';
 import router from '@/router';
 import useCollection from '@/composables/use-collection';
@@ -99,6 +99,7 @@ export default defineComponent({
 		},
 	},
 	setup(props) {
+		const collectionsStore = useCollectionsStore();
 		const fieldsStore = useFieldsStore();
 		const relationsStore = useRelationsStore();
 
@@ -190,7 +191,8 @@ export default defineComponent({
 						state.relations.length === 0 ||
 						isEmpty(state.relations[0].many_collection) ||
 						isEmpty(state.relations[0].many_field) ||
-						isEmpty(state.relations[0].one_collection)
+						isEmpty(state.relations[0].one_collection) ||
+						isEmpty(state.relations[0].one_primary)
 					);
 				}
 
@@ -224,6 +226,12 @@ export default defineComponent({
 					await api.post(`/fields/${props.collection}`, state.fieldData);
 				}
 
+				await Promise.all(
+					state.newCollections.map((newCollection: Partial<Collection>) => {
+						return api.post(`/collections`, newCollection);
+					})
+				);
+
 				await Promise.all(
 					state.newFields.map((newField: Partial<Field>) => {
 						return api.post(`/fields/${newField.collection}`, newField);
@@ -240,6 +248,7 @@ export default defineComponent({
 					})
 				);
 
+				await collectionsStore.hydrate();
 				await fieldsStore.hydrate();
 				await relationsStore.hydrate();
 
diff --git a/app/src/modules/settings/routes/data-model/field-detail/store.ts b/app/src/modules/settings/routes/data-model/field-detail/store.ts
index e3b31e02c2..ff8898e863 100644
--- a/app/src/modules/settings/routes/data-model/field-detail/store.ts
+++ b/app/src/modules/settings/routes/data-model/field-detail/store.ts
@@ -5,9 +5,9 @@
  * It's reset every time the modal opens and shouldn't be used outside of the field-detail flow.
  */
 
-import { useFieldsStore, useRelationsStore } from '@/stores/';
+import { useFieldsStore, useRelationsStore, useCollectionsStore } from '@/stores/';
 import { reactive, watch, computed, ComputedRef } from '@vue/composition-api';
-import { clone } from 'lodash';
+import { clone, throttle } from 'lodash';
 import { getInterfaces } from '@/interfaces';
 import { getDisplays } from '@/displays';
 import { InterfaceConfig } from '@/interfaces/types';
@@ -27,6 +27,7 @@ function initLocalStore(
 	field: string,
 	type: 'standard' | 'file' | 'files' | 'm2o' | 'o2m' | 'm2m' | 'presentation'
 ) {
+	const collectionsStore = useCollectionsStore();
 	const interfaces = getInterfaces();
 	const displays = getDisplays();
 
@@ -51,6 +52,7 @@ function initLocalStore(
 			},
 		},
 		relations: [],
+		newCollections: [],
 		newFields: [],
 	});
 
@@ -141,7 +143,33 @@ function initLocalStore(
 	}
 
 	if (type === 'm2o') {
-		if (!isExisting) {
+		const syncNewCollectionsM2O = throttle(() => {
+			const collectionName = state.relations[0].one_collection;
+
+			if (collectionExists(collectionName)) {
+				state.newCollections = [];
+			} else {
+				state.newCollections = [
+					{
+						collection: collectionName,
+						fields: [
+							{
+								field: state.relations[0].one_primary,
+								type: 'integer',
+								schema: {
+									has_auto_increment: true,
+								},
+								system: {
+									interface: 'text-input',
+								}
+							}
+						]
+					}
+				];
+			}
+		}, 50);
+
+		if (isExisting === false) {
 			state.relations = [
 				{
 					many_collection: collection,
@@ -165,9 +193,13 @@ function initLocalStore(
 		watch(
 			() => state.relations[0].one_collection,
 			() => {
-				const field = fieldsStore.getPrimaryKeyFieldForCollection(state.relations[0].one_collection);
-				state.fieldData.type = field.type;
-				state.relations[0].one_primary = field.field;
+				if (collectionExists(state.relations[0].one_collection)) {
+					const field = fieldsStore.getPrimaryKeyFieldForCollection(state.relations[0].one_collection);
+					state.fieldData.type = field.type;
+					state.relations[0].one_primary = field.field;
+				} else {
+					state.fieldData.type = 'integer';
+				}
 			}
 		);
 
@@ -180,6 +212,8 @@ function initLocalStore(
 				}
 			}
 		);
+
+		watch([() => state.relations[0].one_collection, () => state.relations[0].one_primary], syncNewCollectionsM2O);
 	}
 
 	if (type === 'o2m') {
@@ -322,6 +356,10 @@ function initLocalStore(
 			}
 		);
 	}
+
+	function collectionExists(collection: string) {
+		return collectionsStore.getCollection(collection) !== null;
+	}
 }
 
 function clearLocalStore() {