S.C. Code Ann. § 15-19-250

The execution of the attachment upon any rights or shares or any debts or other property incapable of manual delivery to the sheriff or constable shall be made by leaving a certified copy of the warrant of attachment with the president or other head of the association or corporation or the secretary, cashier or managing agent thereof or with the debtor or individual holding such property, with a notice showing the property levied on.