Ohio Revised Code Title XXIX. Crimes Procedure § 2937.46

(A) The supreme court of Ohio, in the interest of uniformity of procedure in the various courts and for the purpose of promoting prompt and efficient disposition of cases arising under the traffic laws of this state and related ordinances, may make uniform rules for practice and procedure in courts inferior to the court of common pleas not inconsistent with the provisions of Chapter 2937. of the Revised Code, including, but not limited to:

(B) Except as otherwise specified in division (N) of section 4511.19 of the Revised Code, all of the rules described in division (A) of this section, when promulgated by the supreme court, shall be fully binding on all courts inferior to the court of common pleas and on the court of common pleas in relation to felony violations of division (A) of section 4511.19 of the Revised Code and shall effect a cancellation of any local court rules inconsistent with the supreme court's rules.