@Just-Lisa-Now- 

I see that CA has the disregarded entity provision here: https://www.ftb.ca.gov/forms/misc/3556.html

Did we narrow this down enough for you to be able to help?

This still confuses me: "so what? A disregarded entity can issue a K1. How else would I put the income and other info on LLC B's return?"

Because which form is that K-1 from?