N.H. Rev. Stat. Ann. § 301:38

An 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, association or associations, formed in this or in any other state, for the cooperative and more economical carrying on of its business or any part thereof. Any 2 or more associations may, by agreement, unite in employing and using or may separately employ and use the same personnel, methods, means and agencies for carrying on and conducting their respective businesses.