Quarterly return substitution updates CENVAT reporting by prescribing detailed invoice and credit documentation for dealers and importers. Prescribes a substituted Quarterly Return Form under sub rule (8) of rule 9 of the CENVAT Credit Rules, 2004 for first stage dealers, second stage dealers and registered importers, requiring name, excise registration number, address and detailed schedules of invoices and source documents showing invoice/bill of entry details, supplier identification, description of goods, Central Excise Tariff Heading, quantity and amount of duty; directs reporting of the item with maximum duty and allows registered importers to indicate 'Self' as source, and requires authorized signatory details and seal.