Central Excise exemption: specified tariff headings amended to carry nil duty for all goods under those entries. Central government, under section 5A of the Central Excise Act, 1944, amends Notification No. 03/2006 and No. 06/2006 by inserting new tariff table entries specifying particular tariff headings and assigning a nil rate of duty for all goods under those headings, thereby extending duty exemption to those entries.