Excise amendment modifies additional duties regime for goods of special importance, altering levy and application procedures. The Additional Duties of Excise (Goods of Special Importance) Act, 1957 is amended to change how additional excise duties are imposed and administered for goods of special importance, with the specific modifications specified in the Fourth Schedule; the amendment substitutes or varies specified provisions of the principal Act and restructures the statutory basis for levy and procedural application of those additional duties.