To see the data source for Line 14c, right click on the amount then choose "Data Source." TurboTax displays a formula for how this amount is calculated (it can't be overridden for an e-filed return).
Once you know the source, you can set up special allocation(s) for the income flowing to 14c as you did for the other income sources. Just use a different Special Allocation line on the Schedule K-1 Worksheet.
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