GST rate amendments revise tariff classifications and valuation treatment, altering schedule entries and applicability across UTGST rates. Amendments to the Union Territory GST rate notification add a cross reference to the Central GST Act and modify multiple UTGST schedules by inserting, omitting, renumbering and substituting tariff entries and descriptions, including a deeming valuation provision for mixed supplies; the amendments specify HS headings for new items and take effect on the stated commencement date.