S.C. Code Ann. § 63-17-3630: Filing order.

(A) A support order or income-withholding order issued in another state or a foreign support order is registered when the order is filed in the registering tribunal of this State.

(B) A registered support order issued in another state or a foreign country is enforceable in the same manner and is subject to the same procedures as an order issued by a tribunal of this State.

(C) Except as otherwise provided in this part, a tribunal of this State shall recognize and enforce, but may not modify, a registered order if the issuing tribunal had jurisdiction.