(Amended by Ordinance No. 182377, effective December 26, 2008.)  Each Commissioner shall have power and authority, in the direction of activities of their department, to use the officers, employees, material, and equipment in different bureaus or divisions of such department whenever in their judgment the most efficient and economical administration of the affairs of their department requires.  Each Commissioner shall also have authority to direct their subordinate employees to perform duly authorized services for other bureaus or departments.  The appropriations carrying the cost of such services shall be reimbursed by calculating the cost of such services.