The Manager shall serve as the head of the Departments of Public Service and Public Safety until separate positions are created as provided by Section 6.06 and 6.07 of this Charter; and he may act as head of any other department or division of the government, except he shall not act as Solicitor; nor shall he act as the Chief of the Division of Police, or Chief of the Division of Fire. The Manager may designate one person to serve as head of one or more departments or divisions; except that the Solicitor shall not serve or act as head of any other department or division.