To confirm, you want to make after-tax contributions to you 401(k) and then convert it to Roth IRA (Mega Back Door Roth)?
If yes, then the after-tax contributions are not entered into TurboTax. And you will report conversion when you get the 2024 Form 1099-R on your 2024 tax return.
Please see The Mega Backdoor Roth using a Solo 401k Plan and Mega Backdoor Roth IRA and the Solo 401k for additional information.
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