Wyo. Stat. § 20-4-181: Procedure to register child support order of another state or foreign country for modification.

(a) A party or support enforcement agency seeking to modify, or to modify and enforce, a child support order issued in another state shall register that order in this state in the same manner provided in W.S. 20-4-173 through 20-4-180 if the order has not been registered. A petition for modification may be filed at the same time as a request for registration, or later. The petition shall specify the grounds for modification.

(b) 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 under W.S. 20-4-173 through 20-4-180 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 shall specify the grounds for modification.