How to go about doing an Amendment after IRS auto-adjusted my original return

The IRS sent me a letter notifying me that my stimulus check rebate claim was incorrect, and it was, so they adjusted my return automatically to not include it. There is also something else wrong in my 2021 Tax filing I'm trying to fix in an Amendment based off my original filing (Schedule C income that I didn't file correctly). However when I make both changes in my amendment the return calculation is off because TurboTax doesn't know the IRS adjusted my original return automatically. Is there a way to input an auto-adjusted return into TurboTax during an amendment or what is the best way to go about this? Should I be requested a copy of my filed taxes from the IRS and start with that as a baseline for the amendment?

 

Thank you in advance.

I'm using TurboTax Desktop Home & Business 2021 on a windows computer.