you should use sale and purchase module to do so but if you want you need custom development to add links at product form to sale and purchase orders.

Hi Yogesh i got the solution. goto sales orderlines. click on create "button" in the order reference dropdown list select "create and edit" button. It will open the sales order screen. Just select customer and click on save. and click on save for sales orderlines. One quotation will generated with the product of product screen Thank you.