We are having a tough time understanding exactly what you did. If you transferred the 2020 tax file in when you started the 2021 return, the 2020 data that you transferred to 2021 will remain just like it was. All you did was mess up your 2020 return. Go back to the 2021 return and finish preparing it. The changes you made later to 2020 did not go to the new return.
Breathe......later.....later.....if you want to get a correct copy of your original 2020 return you can pay the IRS for a copy.
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