Title 19, Chapter 11, Section 172
(a) If all of the parties who are individuals reside in Georgia and
the child does not reside in the issuing state, a tribunal in
Georgia has jurisdiction to enforce and to modify the issuing
state's child support order in a proceeding to register that order.
(b) A tribunal in Georgia exercising jurisdiction as provided in
this Code section shall apply the provisions of Parts 1 and 2 of
this article and the procedural and substantive law of Georgia to
the proceeding for enforcement or modification. Parts 3, 4, 5, 7,
and 8 of this article do not apply.