Thanks for your reply. I'm preparing a 2016 Corporate return and when I go to the 3805Q and right click on the line I need, it says "jump to input feature not available for this field." The input screen doesn't provide any input for "part III." At least, I can't find any.
I do not believe that section is supported. Lacerte does not do carryback well for CA. When you go to the carryback year, you actually need to pretend it is a carryforward for it to work.