Thanks Karuna for ur Reply,
However if I Opt for Fixed amount , I get the discount of 5000 for 1 Order and the 5000 is getting splitted by the Number of Qty in that sames Order.
Sales Order A with 1 line item with 7 QTY , The reaction : Discount is =5000/ 7. ( 5000 remains as fixed Qty in this case )
Any other correction welcome.