Welcome to the Community, JKam.

I am happy to share with you the steps on how to add discounts to your vendor bills. This gets marked as an income since there is a price reduction instead of adding cost to the business.

Here's how:

1. Go to the Vendors menu. 
2. Select Pay Bills.
3. Choose the vendor bill. 
4. Click the Set Discount button.
5. Enter the Amount of Discount.
6. Select the Discount Account.
7. You can click Add New if the income account is not yet listed.
8. Click Done.
9. Click Pay Selected Bills.

You can also remove discounts for later payments. 

Let me know how it goes or if I can be of additional assistance. I’m always here to help. Take care and enjoy the rest of your day!