In all judicial circuits of this state, except in jurisdictions that have a family court as provided in sections 487.010 to 487.190 the circuit judges shall be vested with power to designate by local circuit court rule and concurred in by a majority of such judges, the division or divisions which shall be juvenile division or divisions and the classes of cases that shall be assigned to each, and may amend such rule from time to time as, in the judgment of a majority of such judges, will best serve the public interest.