Customs tariff amendments update goods descriptions and classifications, inserting items and revising duty treatments across chapters. Amendments to the First Schedule of the Customs Tariff Act substitute, omit and insert tariff descriptions, sub-headings and items across Chapters 1-90, revising commodity nomenclature, adding new tariff lines, aligning entries with specified standards, defining chapter-specific terms (including a Supplementary Note defining Khadi), and updating corresponding rates of duty and 'Other' categories to reflect the revised classifications.