Family Code § 5700.613
ARTICLE 3. Registration and Modification of Child-Support Order of Another State
(a) If all of the parties who are individuals reside in this state and the child does not reside in the issuing state, a tribunal of this state has jurisdiction to enforce and to modify the issuing state’s child-support order in a proceeding to register that order.
(b) A tribunal of this state exercising jurisdiction under this section shall apply the provisions of Chapters 1 and 2, and this chapter, and the procedural and substantive law of this state to the proceeding for enforcement or modification. Chapters 3, 4, 5, 7, and 8 do not apply.