What type of return are you doing? Does "US" work for tthe state?

Agree with George this should do it except you should review your client's facts and circumstances that the domicile is indeed in Mexico instead of CA.  It is possible for one to be a treated for income tax purposes as a nonresident while remaining a domicile of CA.

Changing domicile from one state to another (including CA) has a high bar.  Relocating to and living in Mexico, in itself, is not sufficient proof that domicile has changed.  The safe harbor rule of CA allows domiciliary to be treated as nonresident provided the prescribed conditions are met.

@jcrawf6425 Why is this not helpful?  These entries would produce the FC code you need on a CA-NR return.

WHEN ALL ELSE FAILS READ THE INSTRUCTIONS

If you did not reside in the United States or a U.S. Possession, use the code “FC.” The code “FC” is the abbreviation for foreign country.

ps: typing in all caps is considered yelling and doing so generally indicates a lack of concern and it is hrdr t rd

Maybe the instructions were all in caps and hrdr t rd.

I think you be write! "f y dd nt rsd n th ntd Stts r  .S. Pssssn, s th cd “FC.” Th cd “FC” s th bbrvtn fr frgn cntry."

There is no FC choice but thanks for trying to help.