I am not sure whether or not this will be of any use, but the instructions are on the CA FTB web site.
See https://www.ftb.ca.gov/about-ftb/newsroom/tax-news/august-2019/schedule-k-1-and-withholding.html
With respect to how to enter this into the CA fiduciary module of TurboTax Business, you might want to try Forms Mode. The Interview, Step-by-Step Mode, for state returns will most likely not provide much, if any, guidance as is typical of most consumer-level (and even professional) income tax preparation software for trusts and estates.
