Haw. Rev. Stat. § 415A-3: Purposes.

(a) Except as provided in this section, professional corporations may be organized under this chapter only for the purpose of rendering professional services and services ancillary thereto within a single profession.

(b) A professional corporation may be incorporated for the purpose of rendering professional services within two or more professions, and for any purpose or purposes for which corporations may be organized under chapter 414, to the extent that any combination of professional purposes or of professional and business purposes is permitted by the licensing laws and rules of this State applicable to the professions.