Applying Discounts to Bills

Angela0

I've done a bunch of google searches and help desk searches but can't easily find an answer to this question:

I purchase inventory from a vendor and based on the amount I spend, receive a discount - for example 3%.

The items themselves aren't discounted, just the total invoice.

In order to get accurate profit/loss statements, how do I apply the 3% discount when I enter the bill and reflect the actual amount paid to the vendor?