How to apply discount on Sales Order Net amount (not at line level)

Requirement:-

I need to apply 10% discount on sales order total amount and there should be no discount applied at line level.

• Line 1=500$ 
• Line 2=400$ 
• Line 3=600$ 
• Total=1500$ 
• 10% discount on total of sales order=150$ 
• Net Total......... 1350 

There should be no impact of discount on line level.Selling prices of each line item should be actual i.e without discount. 

Solution:-

At present time, order level discounts which are applied to only the order total are not product functionality; order level discounts will be reflected amongst the order lines. Please follow enhancement request, Bug 2071090 LUMPSUM DISCOUNT AT ORDER HEADER. 

For a potential workaround refer to: How Does One go about Applying a LUMPSUM Discount at Order Header? Document 454938.1