Auxiliary duty amendment adds a new entry to the customs exemption schedule, modifying the prior notification's scope. The Central Government, under powers of the Customs Act and the Finance Act, amends Notification No. 24/91-Cus. by inserting after Serial No. 291 a new serial entry, No. 292, referencing Notification No. 18-Customs dated 15-1-1992, thereby modifying the Schedule of exemptions annexed to the original notification.