If you use a Desktop version of TurboTax, you can view the Tax Payments Worksheet in Forms mode and right click on the field to find the data source. I just did this for a return in Desktop and TurboTax provided this explanation for the source of the entry in Line 3D:
Tax Payments Worksheet : TP Other w/h
Federal Forms 1099-INT, 1099-OID and 1099-DIV, State income tax withheld, if the related state id is CA or blank when CA is the resident state; AND Federal Tax Payments Worksheet, lines 17, 18a, 18b and 18c, state column, if related state id is CA or blank when CA is the resident state.
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