Your ATX software creates an amended return by duplicating the original return, and then adding an amendment forms (1040X, for example) to the duplicated return. You cannot add an amendment form, such as 1040X, to an existing return.
To amend a return, open the desired return, click the Returns menu, and then select Amend Return. This action creates a duplicate return and adds an amendment form, such as 1040X, to the return. The original return remains unchanged.
Duplicating a return for any reason (including amending the return or creating a backup copy) uses one of your available PRS Returns.