Ohio Rev. Code § 3105.08
At any time before a final judgment is entered in a divorce action, the spouses may convert the action for divorce into an action for dissolution of marriage by filing a motion with the court in which the divorce action is pending for conversion of the divorce action. The motion shall contain a petition for dissolution of marriage that satisfies the requirements of section 3105.63 of the Revised Code. The action for dissolution of marriage then shall proceed in accordance with sections 3105.61 to 3105.65 of the Revised Code with both spouses designated as petitioners. No court fees or costs normally charged upon the filing of an action shall be charged upon the conversion of the action for divorce into an action for dissolution of marriage under this section.
R.C. § 3105.08