I received an additional 1099 (combined) after I e-filed my return.
I asked TT (home and biz) to amend the return, but the list of things to change doesn't include a new 1099 (or even a "corrected" one).
The payer participates in TT's "automatic" import system. How do I get TT to let me import the new 1099?
I somehow blundered into being able to go through my personal income sources again, and imported the new 1099. I now have a 1040-X, 540 with schedule X, and corresponding estimated tax forms, ready for printing.
Sorry, I can't say how I managed.