Ind. Code § 31-12-1-2

Sec. 2. In judicial circuits having at least three (3) judges of the superior court, probate court, and circuit court, the judges of the superior, probate, and circuit courts may annually, in January, designate one (1) or more of the judges to hear all cases under this chapter. The designated judges shall hold as many sessions of court each week as are necessary for the prompt disposition of the court's business.