In Criminal Law, the territory of the State is demarcated as Sessions Divisions. Each Session Division is a District.

One Sessions Division comprises with the Chief Judicial Magistrate Court and subordinate Magistrate Courts [if it is rural] or the Sessions Division is comprising with Chief Metropolitan Magistrate and Subordinate Magistrate Courts [if it is City].   

Any alteration; be it sub-division of the existing Sessions Divisions or Districts or formation of a new District, merging of Courts or creation of new Court, the State requires to consult with the High Court of its State before it does anything.