It sounds like you are talking about the entry area for on Form 8938. This is an information only return, and doesn't have any live calculations. Part of the data reported on the form itself is the line numbers where the income can be found on the Form 1040 and its Schedules.
You will need to enter the interest in the interest income section of TurboTax for it to calculate in your return properly.
If you are entering this data somewhere other than the Form 8938 (report of foreign financial assets) section please let us know where you are seeing the questions asking for the form and line numbers.
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