Excise duty revision: widespread substitution of ad valorem and specific rates and insertion of new tariff items. The amendment substitutes new third column duty entries throughout the First Schedule to the Central Excises Act, replacing many existing rates with revised ad valorem percentages and specified specific duties, inserting new sub-items and Items (including hookah tobacco, glycerine categories, floor coverings, and motor vehicle parts), renumbering and adding Explanations to clarify exclusions, and omitting a listed Item, thereby reconfiguring tariff classification and duty incidence across numerous goods.