A party or support enforcement agency seeking to modify, or to modify and enforce, a foreign child support order not under the convention may register that order in this state under sections 601 through 608 [§§48-16-601 through §48-16-608] if the order has not been registered. A petition for modification may be filed at the same time as a request for registration or at another time. The petition must specify the grounds for modification.
West Virginia Legal Code