Ohio Rev. Code Ann. § 1701.78
(B) The agreement of merger or consolidation shall set forth:
(C) The agreement of merger or consolidation may also set forth:
(D) To effect the merger or consolidation, the agreement 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 such corporation held for the purpose, and approved or otherwise authorized by or on behalf of each foreign constituent corporation in accordance with the laws of the state under which it exists. In the case of a merger, the agreement shall also 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 prior to the filing of the certificate of merger or consolidation, the merger or consolidation may be abandoned by the directors of any of the constituent corporations if the directors are authorized to do so by the agreement or by the same vote of shareholders as is required to adopt the agreement. The agreement of merger or consolidation may contain a provision authorizing the directors of the constituent corporations to amend the agreement at any time prior to 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: