Yes, K-1 of 1120-S is for the Federal Return. 100-S is the corporate return for CA, and it also has a state K-1. You said you entered your 1120-S which is the Corporation's tax return. The K-1 is the flow-through document, which is what you really enter in the Federal Section. You list it as an S Corporation. There is a place for the percentage of ownership on the K-1, box F. It's not critical information for your tax return, but it is there. If you leave it blank, that's ok. You don't enter the 100-S in the Federal Section. It's a state form for California.
After you enter your K-1 in the Federal section, and finish with the rest of your federal return, you'll move to the state return. You'll get to the page S Corporation K-1 Summary, and choose Edit. I am adding screenshots to my answer above. You then see a screen S Corporation K-1 Adjustments, and you only make an entry if there is a difference between what the 1120-S K-1 says and the 100-S K-1 says. Otherwise leave the boxes blank.Continue until you enter the Aggregate Gross Receipts, which is on line 17 of your 100-S K-1 (in the space for other information) If there's nothing there, enter zero. Continue until you are done.
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