Haw. Rev. Stat. § 576B-609
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 sections 576B-601 through 576B-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 later. The pleading shall specify the grounds for modification.
[L 1997, c 295, pt of §1; am L 2015, c 77, pt of §1]