Administering Tax Reporting Managing Supplemental Data Working with Supplemental Data Collections Deleting Collections Deleting Collections To delete collections: On the Home page, click Application, and then click Supplemental Data. Click the Collections tab on the left. Select a collection, select Actions, and then Delete. If data exists, you cannot delete the collection. If no data exists, but form instances are created, you cannot delete the collection. From the confirmation prompt, click Yes.