You should contact phone support for specific information on CA withholding and forms in TurboTax.
What is the TurboTax phone number? (intuit.com)
Generally, though, any state tax paid (withheld) would be considered a deduction for the trust if paid by the trust. Obviously, that would be entered on your federal Form 1041.
If a state refund (or tax) is due, that matter would be handled exclusively on the state return.
