Apply a discount to a supplier bill

I asked a question similar to yours and found the following answer. Hope it helps

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@ Jay
There two kinds of vendor discounts, sales and early payment
You do NOT enter a discount for a sales discount, you enter the actual amount paid
Early payment discounts, like when you get 2% off if paid in 10 days, are different. QBO makes this harder than it should be. An early payment discount is income to your business.
In pay bills, click on the bill to bring it up, on the next line select an income account (create one called early payment discount to make it self explanatory) in the account block, calculate and enter the calculated amount in the account block as a negative number, save.
then back in pay bills pay the bill.
As I said QBO makes this harder than it should be, and harder than it is in desktop