Mass. Gen. Laws ch. 209D, § 6-602
Procedure to register order for enforcement.
(a) Except as otherwise provided in section 7–706, a support order or income-withholding order of another state or a foreign support order may be registered in the commonwealth by sending the following records to the appropriate tribunal in the commonwealth:
(d) If 2 or more orders are in effect, the person requesting registration shall: