Where do I enter infor from W-2c for 2020?

[DoninGA]

If the W-2C for 2020 changes your tax data from the original W-2 you will have to amend the 2020 tax return that was filed.

See this TurboTax support FAQ for amending a 2020 tax return originally completed and filed using TurboTax - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/00/27439

[Mike9241]

you do not enter the w-2c as a second w-2. you indicate on the original w-2 that this is corrected and you change only the boxes that have amounts on the w-2C,