Rules of origin determine origin through tariff classification changes or regional value content under a preferential trade agreement. The Annexure prescribes product-specific rules of origin, defining chapter/heading/sub-heading identifiers and four schedule columns. It provides that alternative product-specific rules are individually sufficient, that changes in tariff classification and their exclusions apply only to non-originating materials, and that RVC-only rules require the final production process within a Party. Column 4 codes-CC, CTH, CTSH, RVC(XX) and WO-specify applicable origin tests. The Annexure maps these tests to tariff sub-headings, typically allowing an RVC threshold or a classification-change alternative.