The department shall be divided into such divisions, sections, or offices as may be necessary from time to time. All divisions, sections, or offices in existence immediately prior to July 1, 1989, shall continue to exist in accordance with this article. Thereafter, divisions, sections, and offices shall be abolished, reorganized, or established from time to time by the commissioner and as otherwise specified by law. The commissioner shall appoint such directors, deputies, and assistants as may be necessary to manage such divisions, sections, and offices. Such positions shall be in the unclassified service of the State Merit System of Personnel Administration.