diff --git a/includes/acf/acfe/form-actions/cwps-acf-acfe-form-action-contact.php b/includes/acf/acfe/form-actions/cwps-acf-acfe-form-action-contact.php
index a86b551..79037b1 100644
--- a/includes/acf/acfe/form-actions/cwps-acf-acfe-form-action-contact.php
+++ b/includes/acf/acfe/form-actions/cwps-acf-acfe-form-action-contact.php
@@ -2578,6 +2578,9 @@ public function tab_mapping_accordion_group_add() {
 			$choices[ $group['id'] ] = $group['title'];
 		}
 
+		// Add choice to represent using a custom hook for the group id
+		$choices[0] = 'civicrm_profile_sync_acfe_dynamic_group hook';
+
 		// Add Group choices and modify Field.
 		$group_field['choices'] = $choices;
 		$group_field['search_placeholder'] = '';
@@ -6055,6 +6058,11 @@ public function form_group_save( $contact, $group_data ) {
 				}
 			}
 
+			// If group_id is zero, attempt to set it the result of a filter
+			if ( $group['group_id'] == 0 ) {
+				$group['group_id'] = apply_filters( 'civicrm_profile_sync_acfe_dynamic_group', $group );
+			}
+
 			// Skip if there's no Group ID.
 			if ( empty( $group['group_id'] ) ) {
 				continue;