Each group should be autonomous except in matters affecting other groups or A.A. as a whole. (“Twelve Steps and Twelve Traditions“, Tradition Four)

With respect to its own affairs, each A.A. group should be responsible to no other authority than its own conscience.  But when its plans concern the welfare of neighboring groups also, those groups ought to be consulted.  And no group, regional committee, or individual should ever take any action that might greatly affect A.A. as a whole without conferring with the trustees of the General Service Board.  On such issues our common welfare is paramount. (long form)

… more to be added …