Okla. Stat. tit. 43, § 43-601-609: Procedure to register child support order of another

state for modification.

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 601-601 through 601-608 of this article 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

must specify the grounds for modification.