Ohio Rev. Code § 2153.05
In case of the temporary absence or disability of a juvenile judge, or when the volume of cases pending in the juvenile court necessitates the assistance of an additional judge, and upon the request of a juvenile judge, the presiding judge of the court of common pleas of Cuyahoga county shall designate a judge of the court of common pleas of Cuyahoga county to act as juvenile judge during the absence or disability. If no judge of the court of common pleas is available for that purpose, the chief justice of the supreme court shall designate a juvenile judge, a probate judge, or a judge of the court of common pleas from another county to act as judge. Such judge shall receive the compensation for his services and expenses that is provided by section 141.07 of the Revised Code for judges of the courts of common pleas designated by the chief justice to hold court outside their respective counties.
Vacancies occurring in the office of the juvenile judge of Cuyahoga county shall be filled in the manner prescribed for the filling of vacancies in the office of the judges of the courts of common pleas.
R.C. §2153.05