The city council in a city under the commission plan of government shall have power to discontinue any employment or abolish any office at any time, when, in the judgment of the city council, such employment or office is no longer necessary. The city council shall have power, at any time and at any meeting, to create any office or board it deems necessary, including the office of city manager, and fix salaries. The city council may create a board of three or more members composed of other officers of the city and confer upon such board any power not required to be exercised by the city council itself. The city council may require such officers to serve upon any such board and perform the services required of it with or without any additional pay for such additional service.