Can I efile only my federal return even though i completed both federal and state (Ohio). There is an error that i cant fix on my ohio return?

Yes. You do not have to file both your federal and state returns at the same time. You can file your federal return now and later file your state return when you can fix the error.

Yes, you can e-file your federal return and then select print and mail as the filing option for your state.

As you go through the Pay & File section, you will be asked about your federal first, then your state.