N.C. Gen. Stat. § 50-13.7

(1) Except as otherwise provided in G.S. 50-13.7A, an order of a court of this State for support of a minor child may be modified or vacated at any time, upon motion in the cause and a showing of changed circumstances by either party or anyone interested subject to the limitations of G.S. 50-13.10. Subject to the provisions of G.S. 50A-201, 50A-202, and 50A-204, an order of a court of this State for custody of a minor child may be modified or vacated at any time, upon motion in the cause and a showing of changed circumstances by either party or anyone interested.

(2) When an order for support of a minor child has been entered by a court of another state, a court of this State may, upon gaining jurisdiction, and upon a showing of changed circumstances, enter a new order for support which modifies or supersedes such order for support, subject to the limitations of G.S. 50-13.10. Subject to the provisions of G.S. 50A-201, 50A-202, and 50A-204, when an order for custody of a minor child has been entered by a court of another state, a court of this State may, upon gaining jurisdiction, and a showing of changed circumstances, enter a new order for custody which modifies or supersedes such order for custody.