If you physically worked in Ohio, you file an Ohio non-resident tax form. It's the same form residents use, you just check the non resident box (TurboTax [TT] does that for you). It goes on line 1, column (B) of IT NRC
Ohio Nonresident Credit Calculation. TT does that for you.
Ohio does a convoluted tax calculation for non-residents/part year residents. It calculates tax on total income, then it calculates a non resident/part year resident credit, which it subtracts from the tax it calculated on the total income. The credit is calculated as your non-Ohio income divided by Total adjusted Income multiplied by the total tax. TurboTax (TT) does this by allocating your income as either Ohio or non-Ohio. W-2 income will be allocated by the state name abbreviation shown in box 15 of your W-2. TT will ask you, item by item, in the state section, how much of your other income is Ohio or non-Ohio income. Make sure that your non-Ohio wages show CA in box 15 of your W-2 screen, with the CA amount in box 16.
If your employer did not break down your W-2 between OH and CA, you'll have to do that manually, making two entries on lines 15-20.
This system allows Ohio to apply their highest tax rate, based on your total income, while only taxing your Ohio income.
Ohio has a nonresident credit allocation form.. IT NRC
https://tax.ohio.gov/static/forms/ohio_individual/individual/2022/itnrc.pdf
