Yes, you can ignore it, in TurboTax (TT). Another way to handle it: when you enter your MI W-2, add another line for boxes 15-20 and enter the Ohio info. Since boxes 16-17 are blank, it shouldn't cause any problem
If you itemized deductions, the box 19 amount is deductible on your federal return, so you'll want to get that entered.
If you claim the MI credit for Ohio city tax, you do want to include a paper copy of that Ohio W-2 .
