N.C. Gen. Stat. § 15-6.1

In all cases where a defendant has been convicted in a court inferior to the superior court and sentenced to a term in the county jail or to serve in some county institution other than under the supervision of the State Division of Adult Correction and Juvenile Justice of the Department of Public Safety, and such defendant is subsequently brought before such court for an offense committed prior to the expiration of the term to be served in such county institution, upon conviction, plea of guilty or nolo contendere, the judge shall have the power and authority to change the place of confinement of the prisoner and commit such defendant to work under the supervision of the Division of Adult Correction and Juvenile Justice of the Department of Public Safety. This provision shall apply whether or not the terms of the new sentence are to run concurrently with or consecutive to the remaining portion of the old sentence.