I filed an extension and paid. But I had to start a new return after I realized the wrong prior year data file was uploaded. Now that I am working on a new return, where in the software do I write the extension payment to get credit for it? Thanks

Yes you should enter it.

To enter the amount you paid with an extension (including state extension)  go to

Federal Taxes (or Personal for desktop H&B version)

Deductions and Credits

Then scroll way down to Estimates and Other Taxes Paid

Other Income Taxes - Click the Start or Update button

Next page second section Payments with Extension

Either Visit All or Click Start or Update by the extension you paid

Pay attention to which year you are entering for a State Extension payment.  A prior year state extension payment is also deductible on the federal return so be sure to enter it here.