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 §§ 36-5-2601 — 36-5-2608 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.
Procedure to register child support order of another state for modification
Tenn. Code Ann. § 36-5-2609, under Uniform Interstate Family Support Act — Registration, Enforcement, and Modification of Support Order.
Tenn. Code Ann. § 36-5-2609