Ohio Revised Code Title XXXI. Domestic Relations Children § 3119.07

(A) Except when the parents have split parental rights and responsibilities, a parent's child support obligation for a child for whom the parent is the residential parent and legal custodian shall be presumed to be spent on that child and shall not become part of a child support order, and a parent's child support obligation for a child for whom the parent is not the residential parent and legal custodian shall become part of a child support order.

(B) If the parents have split parental rights and responsibilities, the child support obligations of the parents shall be offset, and the court shall issue a child support order requiring the parent with the larger child support obligation to pay the net amount pursuant to the child support order.

(C) If neither parent of a child who is the subject of a child support order is the residential parent and legal custodian of the child and the child resides with a third party who is the legal custodian of the child, the court shall issue a child support order requiring each parent to pay that parent's child support obligation pursuant to the child support order.