If a new or additional circuit is created, a judge or judges shall be elected or appointed thereto in the same manner as provided by law for the filling of vacancies or newly created judgeships in existing circuits.
During any vacancy from the creation of the new circuit until a judge has been elected or appointed to fill the vacancy and has qualified, terms of the court shall be held by a judge or by judges designated as provided by law in cases of vacancies.
Va. Code § 17.1-510