It depends. You can generally e-file up to 5 state returns for each federal return in TurboTax Online version. TurboTax Desktop allows three state returns with one federal return. However, states have their own rules and each is somewhat different.
You should try to file without checking that box. It's a form you can keep in your tax file until and unless Ohio makes a request since it's not mandatory for every scenario. Attaching it can prevent the need for the Department of Taxation to request additional information. It's all right to keep it until then.
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