Deductions & credits

I have opened my 2020 return in Turbotax to attempt to amend my return.  Is there some provision in the 2020 forms to indicate that a repayment has been made (other than a repayment which was made prior to the filing due date for 2020), which will recalculate my new 2020 tax liability?  Or do I simply adjust the 1099-R form that I received from Fidelity and let Turbotax recalculate my tax liability due?  I had a significant amount of federal and state withholding made on the 1099-R that the distribution was made with, so I can't simply delete the 1099-R form and expect Turbotax to recalculate my tax liability accurately.