Section 7(3) in The Assistants of the Secretariat and Attached Offices Joint Cadre Act, 1989
(3)Promotion to the posts of Deputy Secretary or equivalent posts in the Secretariat Departments and attached offices as are notified by the Department of Personnel and Administrative Reforms and earmarked for promotion from amongst the members of the joint cadre shall be made from amongst the eligible Under-Secretaries and holders of other equivalent posts of the appropriate combined gradation list.
