All salaries and expenses incurred by the council pursuant to this article, including the necessary expenses for travel, board, and lodging of the members of the council and its officers, assistants, and other employees incurred in the performance of the duties and business of the council, shall be paid from the funds appropriated for the use of the council. The salaries and expenses shall be approved in the manner that the council directs, and shall be audited by the Controller in accordance with the rules of the Department of General Services.