Your post is very confusing.

If on the 1120S you can just add the 3 1099's together, if that's 100% of their revenue and enter it on Line 1. If there are sources of revenue beyond the 1099's then you just add that to Line 1 also.

You don't need to show 1099-NEC's on an 1120S. You just need to understand the implications if the total of the 1099's is greater than the total revenue shown on the 1120S. Then a "theoretical" matching problem could occur.

The 1040 doesn't show any of this. It just shows the K-1 apportioned flow-throughs.