Does the amount of the child support order change when the parents have shared parenting?

Not necessarily. Ohio law presumes that the higher-earning parent will pay child support to the lower-earning parent. The court can reduce the child support order:
(1) if it determines that the guideline amount is unjust or inappropriate to the children or either parent and would not be in the best interest of the child because of the extraordinary circumstances of the parents, such as:
-the amount of time the children spend with each parent
-the ability of each parent to maintain adequate housing for the children
-each parent’s expenses, including child care expenses, school tuition, medical expenses, dental expenses, and any other expenses the court considers relevant
or (2) because of any these deviation factors:
-special and unusual needs of the children
-extraordinary obligations for minor children or obligations for handicapped children who are not stepchildren and who are not offspring from the marriage or relationship that is the basis of the immediate child support determination
-other court-ordered payments
-extended parenting time or extraordinary costs associated with parenting time
-the obligor obtaining additional employment after a child support order is issued in order to support a second family
-the financial resources and the earning ability of the child
-disparity in income between parties or households
-benefits that either parent receives from remarriage or sharing living expenses with another person
-the amount of federal, state, and local taxes actually paid or estimated to be paid by a parent or both of the parents
-significant in-kind contributions from a parent, including, but not limited to, direct payment for lessons, sports equipment, schooling, or clothing
-the relative financial resources, other assets and resources, and needs of each parent
-the standard of living and circumstances of each parent and the standard of living the child would have enjoyed had the marriage continued or had the parents been married
-the physical and emotional condition and needs of the child
-the need and capacity of the child for an education and the educational opportunities that would have been available to the child had the circumstances requiring a court order for support not arisen
-the responsibility of each parent for the support of others
-any other relevant factor