Your big bazaar voucher can be used in Big Bazaar, Food Bazaar and Fashion@Big Bazaar stores. Do note that Central and Shoppers stop despite being part of company that owns big bazaar doesn't accept those vouchers. You can't use the voucher code for big bazaar on shopper stop website or retail store. As shoppers stop and Central has partial price paying using their store specific vouchers, they don't allow big bazaar vouchers. Because big bazaar vouchers are meant to be used at full redemption.
You can get more information about this on the Future retail homepage. http://www.futureretail.co.in/promotions/gift-vouchers.html