Business & farm
If the Statement C that you received with your K-1 has amounts related to qualified cooperative payments reported on Form 1099-PATR, there is a TurboTax screen to enter those.
Enter your Statement C the same way as a Statement A, by entering the code Z on the screen for box 20 (no amount needed here). Then Continue until you get to the screen "We need some more information about your 199A income or loss" screen. After you've entered any amounts that "fit" on that screen, Continue to the next screen to check the box for qualified cooperative payments on the "Let's check for some uncommon adjustments" screen.
Here is a screenshot of that "Let's check for some uncommon adjustments" screen:
