I think that may work when using the online Turbotax, but I don't know. I use a downloaded CD version on MAC. It has a FORMS option in the toolbar on top and an option to "Remove Amended Info." When I select that, It says it's going to remove that form (Amended info) and tells me that "Removing the form "Amended Info" will cause all of its data to be discarded." But when I select Remove... the form never gets deleted. The TurboTax summary of my WV tax refund/liability never gets restored. It stays at $0. Glad I printed out the original forms before I created this amended disaster, lol.
