At this point, you may actually find it easier to do a SD100 return by hand, than in TT. For the form, see https://www.tax.ohio.gov/portals/0/forms/ohio_individual/individual/2017/SDIT_SD100_Bundle.pdf
Instructions begin at page 50 at http://www.tax.ohio.gov/portals/0/forms/ohio_individual/individual/2017/PIT_IT1040_Booklet.pdf
You cannot e-file a 2017 or earlier return, using Turbotax (TT). But, it is possible to "I-file" at the Ohio Dept. of taxation web site
