Schedule A, line 5a, represents either state and local income taxes or sales taxes. You can use one or the other but not both.
If your Schedule A, line 5a, used state and local income taxes, they would come from any information return you entered that had state or local taxes withheld, such as W-2s, 1099-Rs, etc.
In addition, if you paid the balance of your 2021 state taxes with your 2021 tax return in 2022, if you paid estimated taxes paid in 2022, or if you paid taxes with an extension to file in 2022, these would also show on Schedule A line 5a.
TurboTax includes a State and Local Tax Deduction Worksheet. You can see it in Forms mode if you use the Desktop/Download version of TurboTax, or by printing/creating a PDF of your complete return in TurboTax Online by following the steps in the link in my previous response.
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