Section 7 in The Indian Cost Accounts Service Rules, 2015
7. Future maintenance of the Service.
(1)Any vacancy in any of the grades referred to in Schedule I, after the initial constitution of the Service as provided in rule 6, shall be filled in the manner specified in sub-rule (2).(2)The method of recruitment, field of selection, minimum qualifying service in the next lower grade and other eligibility conditions for appointment to the various grades of the Service shall be as specified in Schedule II.(3)The suitability of candidates for appointment to the various grades by promotion shall be determined by the Departmental Promotion Committees constituted by the Controlling Authority in the manner specified in Schedule III.(4)Notwithstanding anything contained in these rules, where the Controlling Authority is of the opinion that it is necessary or expedient to do so, it may in consultation with the Commission fill a duty post in any grade by deputation or on short-term contract in accordance with the provisions contained in the Annexure to Schedule II.
