Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.3107

(a) Each proceeding before the court or register is independent of any other proceeding involving the same estate.

(b) A petition for a formal court order may combine various requests for relief in a single proceeding if the order sought may be a final order and may be granted without delay.

(a) A petition is not defective because it fails to embrace all matters that might then be the subject of a final order.

(b) A proceeding for probate of a will or an adjudication of no will may be combined with a proceeding for appointment of a personal representative.

(c) A proceeding for appointment of a personal representative is concluded by an order making or declining the appointment.