Mass. Gen. Laws ch. 43 § 5
Until superseded under this chapter, the organization of the executive and administrative departments, and the powers and duties of the officers and employees of any city adopting any of the plans provided for in this chapter, and the fiscal year of such city shall remain as constituted at the time of the adoption of such plan; but the city council or other legislative body may at any time by ordinance, consistent with general laws, reorganize, consolidate or abolish departments, in whole or in part; transfer the duties, powers and appropriations of one department to another, in whole or in part; establish new departments; and increase, reduce, establish or abolish salaries of heads of departments or members of boards. This section shall not authorize any action in conflict with chapter thirty-one.
This section shall not authorize the city council in any city which adopts Plan D or E to take any action to accomplish any result not contemplated by the provisions of the said plans.
Mass. Gen. Laws ch. 43, § 5