Indiana Code Title 20. Education § 20-23-5-11

Sec. 11. (a) Within sixty (60) days after the annexation takes place, the governing body of the acquiring school corporation and losing school corporation shall adopt a plan determining the manner in which the governing body shall be constituted.  The plan shall be adopted in accordance with the requirements and procedures of IC 20-23-8, except as set out in subsection (b).

(b) The adoption of a plan by the governing body in accordance with IC 20-23-8-10 and its submission to the state board under IC 20-23-8-15 are the only procedures required when an existing plan is changed as follows:

If a school corporation elects or appoints members of its governing body both from a school governing body member district encompassing the entire school corporation and from smaller districts, the governing body of the acquiring school corporation shall add the annexed territory both to the district consisting of the entire school corporation and to one (1) or more smaller districts.  In a comparable situation, the losing school corporation shall delete the annexed territory both from the district consisting of the entire school corporation and from any smaller district or districts.  The change in the plan becomes effective upon its approval by the state board.  The application of this subsection does not limit the initiation of, or further changes in, any plan under IC 20-23-8.