The commissioner has the power, having regard to the efficient performance of the department's functions, to create positions in the department and in any division, region, agency, institution or service of the department for the accomplishment of the purposes of this part and to abolish these positions and the existing positions of officers and employees who by this part are transferred to the department. The positions in the department shall be classified by the commissioner according to the nature of the duties to be performed and the minimum qualifications for appointment, and such appointments shall be made on a merit basis. The commissioner, having regard to the nature of the services to be performed and the salaries paid for similar work elsewhere, shall establish a salary range for each class of position and within such salary range shall provide by rule for recognition of efficiency of service and length of service. All matters relating to personnel of the department shall be handled in accordance with, and under rules and regulations promulgated pursuant to authority of, title 8, chapter 30, parts 2 and 3.