State tax filing

TurboTax does have an entry spot for that specific credit.   Page through the Alabama state credits until you come to the screen titled Let's Check for More Alabama Credits.  The next to last line item is for the AL Investment Credit.  If you click Start or Update there, you can enter all the information and TurboTax will complete Part P.    There is a screenshot of Schedule OC, Part P below.   The amending instructions are linked here.