Section 26A(1) in The Bihar Civil Service (Executive Branch) and the Bihar Junior Civil Service (Recruitment) Rules, 1951
(1)Promotion to Junior Selection Grade shall be made from amongst the officers whose names find place in the Sub-divisional Officers' list mentioned in sub-rule (2) of this Rule, in the order in which the names of officers are arranged in the said list, so however, that due representation in promotion to Junior Selection Grade is accorded to the officers belonging to Scheduled Castes and Scheduled Tribes in accordance with the reservation rules in force.