Tariff classification amendment: substituted excise tariff headings to align exemptions with the updated schedule, effective at commencement. Amends notification No. 11/2017-Central Excise by substituting specified tariff headings in the table of exemptions to align that notification with the amended Fourth Schedule; the substitutions update the tariff classification entries for listed serial numbers and take effect from the stated commencement date, thereby revising the tariff references applicable to miscellaneous exemptions under the Central Excise framework.