Section 11(1)(c) in The Rajasthan State Pollution Control Board Employees Service Rules and Regulations, 1993
(c)Where a post is to be filled in by more then one method as prescribed in the rule or schedule, the appointment of vacancies, determined under clause (a) above, to each such method shall be done maintaining the prescribed proportion for the over all number of posts already filled in.; if any fraction of vacancies is left over, after appointment of the vacancies in the manner prescribed above, the same shall be apportioned to the quota of various methods prescribed in a continuous cyclic order giving precedence to the promotion quota.