The Council by ordinance may create, change and abolish offices, departments, commissions, boards and agencies other than the offices, departments, commissions, boards and agencies established by this Charter. The Council by ordinance may assign additional functions or duties to officers, departments, commissions, boards and agencies established by this Charter, but may not discontinue or assign to any other office, department, commission, board or agency any function or duty assigned by this Charter to a particular office, department, commission, board or agency.