Fam. Code, § 17404.2

(a) If, prior to filing, a petition or comparable pleading pursuant to Part 6 (commencing with Section 5700.101) of Division 9 is received by the local child support agency or the superior court and the county in which the pleadings are received is not the appropriate jurisdiction for trial of the action, the court or the local child support agency shall forward the pleadings and any accompanying documents to the appropriate court of this state or to the jurisdiction of another state without filing the pleadings or order of the court, and shall notify the petitioner, the California Central Registry, and the local child support agency of the receiving county where and when the pleading was sent.

(b) If, after a petition or comparable pleading has been filed with the superior court of a county pursuant to Part 6 (commencing with Section 5700.101) of Division 9, it appears that the respondent is not or is no longer a resident of the county in which the action has been filed, upon ex parte application by the local child support agency or petitioner, the court shall transfer the action to the appropriate court of this state or to the appropriate jurisdiction of another state and shall notify the petitioner, the respondent, the California Central Registry, and the local child support agency of the receiving county where and when the pleading was sent.

(c) If, after entry of an order by a court of this state or an order of another state registered in a court of this state for enforcement or modification pursuant to Part 6 (commencing with Section 5700.101) of Division 9, it appears that the respondent is not or is no longer a resident of the county in which the foreign order has been registered, upon ex parte application by the local child support agency of the transferring or receiving county or the petitioner, the court shall transfer the registered order and all documents subsequently filed in that action to the appropriate court of this state and shall notify the petitioner, the respondent, the California Central Registry, and the local child support agency of the transferring and receiving county where and when the registered order and all other appropriate documents were sent. Transfer of certified copies of documents shall meet the requirements of this section.

(d) If, in an action initiated in a court of this state pursuant to Part 6 (commencing with Section 5700.101) of Division 9 or a predecessor law for interstate enforcement of support, the petitioner is no longer a resident of the county in which the action has been filed, upon ex parte application by the petitioner or the local child support agency, the court shall transfer the action to the appropriate court of this state and shall notify the responding jurisdiction where and when the action was transferred.

(e) Notwithstanding subdivisions (b) and (c), if the respondent becomes a resident of another county or jurisdiction after an action or registered order has been filed pursuant to Part 6 (commencing with Section 5700.101) of Division 9, the action may remain in the county where the action was filed until the action is completed.