If you prepare a prior year return in TurboTax desktop/download, you can only carry that information forward into a new return.
For instance, if you complete and save 2017 and want to carry that information forward to 2018, you can't carry that information forward into an existing return.
You can 'save as' an existing return with another name, so that you can save the information you entered; but when you carry forward information from a prior year TurboTax creates a new return.
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