Why enter 2017? You could start a fake return and enter 2017 pretending it is 2018 amounts just to see how 2017 looks on the new forms. But you can’t enter 2017 to store it. You can only do a 2018 return with the 2018 program.
Are you trying to transfer 2017 into 2018? What program did you use last year? Here’s an article on what you need from 2017 to transfer into 2018.
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