Ohio Rev. Code Ann. § 3121.34

A person required to comply with withholding or deduction notices described in section 3121.03 of the Revised Code shall determine the manner of withholding or deducting from the specific requirement included in the notices without the need for any amendment to the support order, and a person required to comply with an order described in sections 3121.03 and 3121.04 to 3121.06 of the Revised Code, or an administrative order issued under section 3121.12 of the Revised Code shall comply without the need for any amendment to the support order.