I'm using the CD version of TurboTax. How do I delete 1040x, so that I can save a copy of my original return?

I filed my 1040. Now, I need to amend. But, I used the CD version of TurboTax to amend without first saving a copy of my original file. So, I need to know how to use the CD version of TurboTax to delete the 1040x, so as to get back to my original return.