The 2020 Form 1040-X (which is entitled Amended U.S. Individual Income Tax Return) is the form that you will be amending when you log back into your TurboTax account, and begin the amendment process. The 2020 1040-X is a two page form and given the information your provided, as you proceed through the TurboTax application, your answers to questions will populate answers on the first page of Form 1040-X, and probably Part III on the second page of Form 1040-X. You will not be seeing a question or a box relating to unchecking box 32 b and checking box 32 a. Rather you will be answering questions that will show how the original amounts entered on your 2020 Form 1040 have changed and additionally, the net change to such original amounts.
Because you have indicated that your 2020 Form 1040, Schedule C should have reflected that you were at risk with respect to your investment in your business, (box 32 a), then those deductions and expenses that were disallowed because you were not at risk, will now be allowed on your Form 1040-X. The net change as a result of adding back in those expenses or deductions will be reflected in the Net Change column on Form 1040-X.
Included below is a link to the 2020 Form 1040-X. Upon review of that form you will see that on the first page there are three columns where the Original Amount is entered, then the Corrected Amount, and the Net Change.
2020 Form 1040-X
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