N.C. Gen. Stat. § 160A-3

(1) When a procedure that purports to prescribe all acts necessary for the performance or execution of any power, duty, function, privilege, or immunity is provided by both a general law and a city charter, the two procedures may be used as alternatives, and a city may elect to follow either one.

(2) When a procedure for the performance or execution of any power, duty, function, privilege, or immunity is provided by both a general law and a city charter, but the charter procedure does not purport to contain all acts necessary to carry the power, duty, function, privilege, or immunity into execution, the charter procedure shall be supplemented by the general law procedure; but in case of conflict or inconsistency between the two procedures, the charter procedure shall control.

(3) When a power, duty, function, privilege, or immunity is conferred on cities by a general law, and a charter enacted earlier than the general law omits or expressly denies or limits the same power, duty, function, privilege or immunity, the general laws shall supersede the charter.