Although it's possible to do a Columbus City return, in TurboTax (TT), you'll find it easier to do at the city web site (either file online or print forms). https://www.columbus.gov/incometaxdivision/
You apparently work somewhere else, other than Columbus, if your employer didn't withhold city tax.
You
normally only have to file a return in the city you live in. It is not
necessary to file one in the city you work in, if different. Your employer will
remit withholding to the city you work in, but you do not file a return unless
you're claiming a refund or your employer didn't
withhold enough ( both highly unusual). The city you live in will allow a
credit or partial credit for the withheld tax you paid to the work location
city.
There are 2 state wide agencies that help Ohio
Cities collect City Income taxes. One is CCA (Central Collection Agency) and
the other, larger one, is RITA (Regional Income Tax Agency). Columbus
will accept CCA forms, even though it is not an official member of CCA . In the TT Ohio
program, you will reach a screen titled "A few things before we wrap up
your state taxes" (Other tax Situations at the Summary Screen). Scroll
down to Ohio City Taxes. Press Start or revisit. On the next page select City
tax forms. You cannot e-file, but will have to print & mail.