The Planning Commission may adopt the master plan of the City of Reed City, including any areas outside of its boundaries, which, in the City Council's judgment, bear relation to the planning of said City, as a whole by a single resolution, or the Commission may, by successive resolutions, adopt successive parts of the plan, said parts corresponding with major geographical sections or divisions of the Municipality and surrounding areas or with functional subdivisions of the subject matter of the plan, and may adopt any amendment or extension thereof or addition thereto.
(1981 Code § 5.8)