We have introduced a method of deleting data in bulk from most field types via the importer. This can only be completed for pre-existing Form Results.
Users can bulk clear data by creating an Import Data Map Template as they would for an import where they intend to create or update data.
They can then add the uids of any existing Form Results and the associated Contacts.
In order to delete data the following values must be entered into the column for the desired field to be deleted:
Most fields: <NULL>
Multiselect Fields: 0
Holiday Fields (only applicable to Session Forms): {}
Boolean: false