See this TT FAQ
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-enter-a-backdoor-roth-ira-convers...
in particular pay careful attention to the "Yes, make part of my IRA contribution nondeductible" question.
the FAQ is seems to be talking about doing the IRA contribution and conversion in the same tax year. If it's in a different tax year the procedure may be a little different. Please ask again in that case it if doesn't work.
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