Yes, you create separate K-1's for the same "main" entity when multiple entities are reporting Section 199A information on a single K-1. And yes, for each K-1 you create, you have to disaggregate the numbers for all the boxes being reported on the single K-1. So, each K-1 has all the boxes, not just box 20, that apply to that particular entity (main or passthrough).
If you can't deduce the box numbers for each separate entity from the information you have, you'll need to contact the preparer of the K-1 for that information.
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