S.C. Code Ann. § 63-17-1910
Any person who is the obligor on a support order of another jurisdiction may obtain voluntary income withholding by filing with the clerk of court a request for withholding and a certified copy of the support order of a sister state. The clerk of court shall issue a notice to withhold under Section 63-17-1450(B). Payment must be made to the State Disbursement Unit.