Section 12(3)(b) in The Code of Criminal Procedure, 1973
(b)Subject to the general control of the Chief Judicial Magistrate, every Sub-Divisional Judicial Magistrate shall also have and exercise, such powers of supervision and control over the work of the Judicial Magistrates (other than Additional Chief Judicial Magistrates) in the sub-division as the High Court may, by general or special order, specify in this behalf.