Concurrent jurisdiction allows allocation of appeal cases across a zone through internal allocation mechanisms to expedite disposal. Amendments grant concurrent jurisdiction to Commissioners of Central Excise (Appeals) across their zone and extend the Chief Commissioner's authority to specify individual Commissioners' jurisdictions and to allocate additional charges or individual appeal cases among Commissioners within the zone to facilitate early disposal, while preserving the norm that each Commissioner ordinarily handles appeals from specified Commissionerates unless reassigned by Chief Commissioner orders.