Because I had dozens of small fractional share sales to report and wanted to keep the pennies accurate, I did my forms on paper this year and that involved first attaching a Schedule A to my CA return and entering the additional CA itemized deductions on Schedule CA. To handle it in TurboTax, go ahead and first enter your federal itemized deductions as per usual and then in the CA section you'll be given a list of items that CA handles differently, one of them being Investment Income Expenses.
