Hi arafath,

Your idea of adding the discount in the next line also works. Just make sure to select the right account to track it. I suggest consulting with an account on what account to use for your discount item.

Here's how to add a discount item.

1. Go to +New, then Bill.
2. Enter the Vendor name, in the Item details section add your item and amount.
3. On the next line, click the drop-down arrow under Product/Service.
4. Select + Add new.
5. Choose Service, then enter "Discount" as your service name.
6. Input other service item information.
7. Hit Save and close.

Once done, enter a negative amount for the discount.

The attached screenshot below will show you how it looks like to add the discount on the bill.

I've also added this article about "How to group Accounts Receivable or Accounts Payable account types" for your reference.

Please let me know if you have other questions. I'm always here for you. Cheers.