N.C. Gen. Stat. § 128-1.2
Except when the resolution of appointment provides otherwise, whenever the governing body of a county or city appoints one of its own members or officials to another board or commission, the individual so appointed is considered to be serving on the other board or commission as a part of the individual's duties of office and shall not be considered to be serving in a separate office.
As used in this section, the term "official" means (i) in the case of a county, the county manager, acting county manager, interim county manager, county attorney, finance officer, or clerk to the board and (ii) in the case of a city, the city manager, acting city manager, interim city manager, city attorney, finance officer, city clerk, or deputy clerk. As used in this section, the term "city" has the meaning provided in G.S. 160A-1.
N.C. Gen. Stat. § 128-1.2