Customs tariff exemption amendment updates item classifications and duty rates, inserting new entries and omitting obsolete ones. The Central Government, invoking delegated public-interest power, amends the notification table by inserting new tariff entries, substituting commodity codes and duty columns, omitting an obsolete serial entry, and replacing a serial block with multiple new entries each bearing distinct tariff codes and duty treatments, thereby restructuring exemptions and applicable duty rates under the existing notification.