(a) In Dallas County and Tarrant County, a majority of the district judges with civil jurisdiction may appoint an assignment clerk to serve under the judges of the district courts of each county in the setting and disposing of cases on the general jury docket.
(b) The commissioners court of each county shall set the salary of the assignment clerk on recommendation of the district judges. The salary shall be paid in monthly installments on vouchers approved by the presiding judge of the district courts.