Georgia Code Title 15. Courts § 15-18-95

If the prosecuting attorney of a municipal court is disqualified from engaging in the prosecution of a particular case or is unable to perform the duties of said office due to illness or incapacity, the governing authority shall provide for the appointment of a substitute prosecuting attorney. At any time in which a substitute prosecuting attorney is not available or an appointment has not been made, the city attorney of the applicable municipality may serve as the substitute prosecuting attorney until such time as a prosecuting attorney or substitute prosecuting attorney is available or appointed.