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.
Thanks for the reply. I have done exactly as you outlined more than 20 times, with no success. The fund gives me the exact % for Ohio. My drop down choice: "Multiple states, not a choice of 'more than one state'". I have calculated and entered the bond fund correctly for more than 10 years, but this year the data does not correctly transfer to the Ohio state return, no matter what I do. I have decided to file Ohio independently, as it allows me to enter the correct numbers directly. Thanks, again.