You should input any deductions you have into your federal return, and any of these that are also valid for your state return will populate on your state return. (You'll still have the option to take the standard deduction on your federal return after you've input these deductions, if that's what you want.)
Then, go through your state tax program from the beginning. Look for a screen that asks which deduction you want to take. The exact placement of this screen varies by state, but most likely you'll find it at the beginning of the interview or right before the deductions section.
Some states don't have itemized deductions, while others require you to choose the same deduction you took on your federal return. When you get to your state return, the TurboTax program let you know what’s available according to your state's tax laws.
