Benefits of duty under Advance authorisation - Customs - Exim - SEZ

Sir/mam, 1.How can we take the benefit of duty on domestic inputs (Raw material) against advance authorization. 2. Is any benefits of IGST or refund on input from domestic purchase 3. Can take the benefits EPCG and Advance authorization both parallel. As per my understanding only custom duty benefits available on advance authorization. IGST refund on export only and DBK/RODTEP also available with AA/EPCG. MK