S.C. Code Ann. § 33-47-1140

Any association may, upon resolution adopted by its board of directors, enter into all necessary and proper contracts and agreements and make all necessary and proper stipulations, agreements, contracts and arrangements with any other cooperative corporation or association formed in this or in any other state for the cooperative and more economical carrying on of its business or any part thereof. Any two or more associations may, by agreement between them, unite in employing and using or may separately employ and use the same methods, means and agencies for carrying on and conducting their respective businesses.