Haw. Rev. Stat. § 437B-8: Powers to classify and limit license.

(a) The board shall adopt rules necessary to effect the classification of motor vehicle mechanics in a manner consistent with the certification program established by this chapter, and shall limit the motor vehicle repair activities of a licensee to those areas for which the licensee is certified or licensed.

(b) An applicant may make application for [licensure] in more than one classification if the applicant is certified for each classification and otherwise meets the qualification for [licensure] as prescribed by the board. If the applicant is licensed for more than one classification, the applicant shall pay the license fee but shall not be required to pay any additional license fee.