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Where in TT online can I record all the prior year contributions so my basis is calculated correctly?

If you did not have this information carry forward automatically from the 2020 return  (this information for 2011, 2012 & 2020 should be reflected on the last form 8606 filed on the 2020 return)  then it  is  entered when you complete  the 2021  non deductible IRA contribution.