The below steps to Configure ecommerce shop coupons:-
1) In Admin Role Menu Settings --> Configuration --> Sales
Customer Features check "Use pricelists to adapt your price per customers" and Apply
2) Create/Edit PriceList and Subtab Create PriceList Version and Price List Item using the below odoo document link
https://doc.odoo.com/6.1/book/6/6_16_Sales/6_16_Sales_pricing/
You can define/Edit a pricelist from the menu Sales --> Configuration --> Pricelists --> Pricelists
For each list you should define:
Promotional Code (is equal to Coupon Code)
a Name for the list,
a Type of list: Sale for customers or Purchase for suppliers,
the Currency in which the prices are expressed.
In sub tab create Price List Version and Price List Items
3) In the Page http://localhost:8069/shop/cart
Menu --> Customize --> check "Reduction Code" after tht you can view "Coupon Code" options
and Apply based on the Product Pricelist Rule amount will be calculate
One good example for what I'm seeking is this Shopify addon: http://apps.shopify.com/bulk-discounts