Cal. Fam. Code § 5236

The state agency or the local agency, designated to enforce support obligations as required by federal law, shall allow employers to simplify the process of assignment order withholding by forwarding, as ordered by the court, the amounts of support withheld under more than one order in a consolidated check, accompanied by an itemized accounting providing names, social security number or other identifying number, and the amount attributable to each obligor.