My state does allow this
The following states allow you to itemize deductions on just the state return: Alabama, Arizona, Arkansas, California, Delaware, Hawaii, Idaho, Iowa, Kentucky, Minnesota, Mississippi, Montana, New York, North Carolina, Oregon, and Wisconsin .... so which state are you filing ???
I am in one of the states that allows me to file with a standard deduction on Federal and itemize on State. I did it last year using the fillable online forms from the state. I will probably do that again this year because Turbo Tax won't do it for me.
Last year I decided I'd let Turbo Tax do it this year. It's pretty simple to do it through my State, but the forms take a long time to fill out online, and that's the best way to e-file with my state. I thought it might be worth the fee to avoid the hassle of the online forms. But I've already spent almost as much time trying to get Turbo Tax to handle it; it won't.
If I go back to my Federal return and select to itemize, it changes both my federal and state tax refund/due. But there's no way to select a different option for my state, unless it's hidden in some secret place that I can't find. I've gone through three additional times, and it's not there.
Unless you know where it is.