I receive calsl asking whether a parent can register an out of state order here in Texas. The answer is, yes, but to what end?
In Texas, to register an our-of-state Order, you follow the steps listed in Texas Family Code 159.602.
Registering an Order from another state is usually accompanied with a request to modify that order, or enforce it. Rarely are out-of-state Orders just registered in the local court's files just for good measure.
When parties are living in different states it can become very complicated very quickly to enforce or modify a court order. You run into problems with Jurisdiction and proper Venue that may restrict where and how you can proceed with your case.
If you live in a different state from the other parent and/or the children then it is vital for you to consult with an experienced attorney. UIFSA, UCCJEA, and the Uniform Parentage Act will need to be consulted and applied to your specific case facts.