S.C. Code Ann. § 20-7-1328
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 subsection (2) of subsection (E) of Section 20-7-1315. Payment must be made to the clerk of court.