not familiar with how this is handled for CA but generally I don't think the state programs have a worksheet to drill down the state taxable amount, you should have a line somewhere for additions to Federal income that is taxable on your state return.
Tying it back to Federal depends the complexity of your situation and I use a spreadsheet offline to tie the net amount back to 1040 Line 2a in total and then the state breakdown, but it should include:
1099-INT Box 8 less Box 13 less any accrued interest adjustments
plus 1099-DIV Box 12 amount for CA taxable bonds
plus 1099-OID Box 11 less Box 6/10 or other adjustments
But there are a few issues to be aware of:
1. If you have adjustments (e.g. accrued interest paid on an individual bond) to a 1099 which has multiple income types (e.g. Box 1 or 3 as well as Box 8 ) then Turbo doesn't know which box to assign the adjustment to and will spread it across all of them. you need to split the 1099 in this case to isolate the income box with the adjustment.
2. if you have premium adjustments and hold multiple state bonds some CA exempt and some CA taxable, again Turbo doesn't know from the 1099 how to assign the premium to CA or non-CA bonds. The only way to get an accurate tax for CA is to split the 1099 between CA and non-CA bonds.
3. For 1099-DIV Box 12 if you provide a state breakdown, at least on Desktop (not sure Online) there is a bug where it can get stuck assuming the entire amount is CA exempt. If you are not seeing CA tax go up when entering the 1099-DIV Box 12 state breakdown that usually means this is happening. See here for this issue
https://ttlc.intuit.com/community/taxes/discussion/re-how-to-enter-muni-bond-from-non-nys-sources-in...
