All employees of the county as herein defined shall be subject to the personnel rules and regulations in or promulgated pursuant to this article. Present employees and those who may hereafter be employed shall remain in their respective employments during good behavior, efficiency, and adherence to such rules and regulations as may, from time to time, be prescribed by the commission. Nothing herein contained shall be construed to prevent or preclude the transfer or removal of an employee, in the sole discretion of the commission, for the purposes of cost or budget reduction, and no present employee shall be subject to any examination in order to hold his or her present job.