After you file

I have duplicated the original return.  Do I have to start a new one?  If I do, how do I import the data from the original return I am amending?  When I start an AMENDED return, it asks for all the data, from W-2, names, address, etc. Turbotax must have done better than that.  It must import data from the original return somehow. 

 

Can I change my duplicated return into an Amended return?  If so, which is the switch?  How can I find it?  Please do not say "Search on 'amend'" as that doesn't work. Thanks so much for your help.