Section 742(6)(h) in Police Regulations, Bengal , 1943
(h)On permanent vacancies becoming available in the Range/Brigade, the Deputy Inspector-General in a Board with all Superintendents of Police/Commandants of the Range/Brigade will scrutinise the records of the officiating Sub-Inspectors who have successfully undergone the training course in the Police Training College and declare fitness for confirmation of the incumbents in order of seniority of the names in the Approved List of the Range/Brigade mentioned in sub-clause (f) above.(F)Permanent promotion to the rank of Armed Sub-Inspectors of those head constables who are already officiating as Armed Sub-Inspectors, before the above rules come into force, shall be in accordance with the procedure given below :-