Sec. 3. (a) Upon:
(1) the juvenile court's own motion;
(2) the motion of a child; or
(3) the motion of the child's parent, guardian, or custodian;
the juvenile court may assign a case to a juvenile court in the county of a child's residence at any time before the dispositional hearing.
(b) Supervision of a child may be assigned to a juvenile court in the county of the child's residence.
(c) The assigning court shall send to the receiving court certified copies of all documents pertaining to the case.