It depends. Schedule K-1 (1065) Box 16 will trigger the Schedule K-3 questions in TurboTax. For the 1120-S version, Box 14 is used for Schedule K-3.
In either case, check the relevant box and continue through the K-1 screens until you are asked for more information about the K-3 or foreign activity.
Note that Box 20 of Schedule K-1 (1065) is used for Section 199A QBI entries. These also appear later in the interview if you check this box.
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