Hello @tallenDPI,

You can create a vendor credit as a discount for your bills and it'll be used automatically  use it when paying them.

1. Go to the Plus icon.
2. Under Vendor, select Vendor Credit.
3. Select a vendor.
4. Choose an item or account.
5. Enter the amount of discount.
6. Click Save and close.

Once done, here's how you can use the vendor credit as a discount when paying your bills:

1. Go to the Plus icon.
2. Under Vendors, select Pay bills.
3. Select a bill transaction.
4. Vendor credits will be used under the CREDIT APPLIED column.
5. Enter the remaining amount to pay on the PAYMENT field.
6. Click Save and close.

Here's an article you can read to learn more about how to use a vendor credit: Enter a credit from a vendor.

I've got you this helpful article in case you need some ideas especially in managing your vendor's transactions: Income and Expenses.

You can always get back into this post if you have more questions.