You enter it in the Federal section of TurboTax.
If your mutual fund company provided you a breakdown, you are only interested in your home state*. Multiply the % for your state by your total tax exempt dividends to get a $ amount (you can't enter the % in TurboTax [TT]). When asked which state, check the box "I earned tax exempt dividends in more than one state". In the drop down menu, select Ohio and enter the $ amount you calculated. In the 2nd box, select "More than one state" (at the bottom of the scroll down list) and enter the remaining dollar amount.
*Your state will tax all the dividends except the dividends from municipal bonds from your state.
