Indiana Code Title 36. Local Government § 36-7-4-511

Sec. 511. (a) Each amendment to the comprehensive plan must be approved according to the procedure set forth in the 500 series.

(b) ADVISORY--AREA.  If the legislative body wants an amendment, it may direct the plan commission to prepare the amendment and submit it in the same manner as any other amendment to the comprehensive plan.  The commission shall prepare and submit the amendment within sixty (60) days after the formal written request by the legislative body.  However, the legislative body may grant the commission an extension of time, of specified duration, in which to prepare and submit the amendment.