But will it make any difference on CA returns?

It depends whether your total CA itemized deductions exceed the Ca standard deduction. If you use the CA standard deduction, it would not make any difference.

Using itemized it need to be greater than 2% of your AGI, correct?

I could not locate the "Adjustments to Income" in the California "Show Topic List."  Please help!

Were Investment Income Expenses deductible on CA or Fed returns earlier than 2018?

Enter your investment advisory fees  and other miscellaneous deduction in the Itemization section of the Federal  return.   They won't count for Federal taxes but Turbo Tax carries them to your CA return  and adds them. subject to 2% threshold, to your Federal itemization.  You can view the result by going to the forms view   and going to the CA form which shows the addition of the miscellaneous expenses to the Federal Itemized expenses.