Ohio Rev. Code Ann. § 1701.781
(B) The agreement of merger or consolidation shall set forth all of the following:
(C) The agreement of merger or consolidation also may set forth any of the following:
(D) To effect the merger or consolidation, the agreement of merger or consolidation shall be approved by the directors of each domestic constituent corporation, adopted by the shareholders of each domestic constituent corporation, other than the surviving corporation in the case of a merger, at a meeting of the shareholders of each corporation held for the purpose, and approved or otherwise authorized by or on behalf of each other constituent entity in accordance with the laws under which it exists. In the case of a merger, the agreement also shall be adopted by the shareholders of the surviving corporation at a meeting held for the purpose, if one or more of the following conditions exist:
(G) At any time before the filing of the certificate of merger or consolidation under section 1701.81 of the Revised Code, the merger or consolidation may be abandoned by the directors of any constituent corporation, the general partners of any constituent partnership, or the comparable representatives of any other constituent entity if the directors, general partners, or other representatives are authorized to do so by the agreement of merger or consolidation or by the same vote of shareholders, partners, or others as is required under division (F) of this section to adopt the agreement. The agreement of merger or consolidation may contain a provision authorizing the directors of any constituent corporation, the general partners of any constituent partnership, or the comparable representatives of any other constituent entity to amend the agreement at any time before the filing of the certificate of merger or consolidation, except that, after the adoption of the agreement by the shareholders of any domestic constituent corporation, the directors shall not be authorized to amend the agreement to do any of the following: