Ohio Rev. Code § 4117.04
When the state employment relations board notifies a public employer that it has certified an employee organization as exclusive representative for a unit of its employees, the public employer shall designate an employer representative and promptly notify the board and the employee organization of his identity and address. On certification, the employee organization shall designate an employee representative and promptly notify the board and the public employer of his identity and address. The board or any party shall address to the appropriate designated representative all communications concerned with collective relationships under Chapter 4117. of the Revised Code. In the case of municipal corporations, counties, school districts, educational service centers, villages, and townships, the designation of the employer representative is as provided in division (C) of section 4117.10 of the Revised Code. The designated representative of a party may sign agreements resulting from collective bargaining on behalf of his designator; but the agreements are subject to the procedures set forth in Chapter 4117. of the Revised Code.
R.C. §4117.04