Discount invoice

[LuanK]

Hello, I hope you are well! I have a question, how can I apply a discount to an invoice without 'Add Billable Item'

[joedavis]

If the invoice is already created, just add a new item with a negative amount for the discount.

If you want the discount to apply to invoices for a product, use a promotion code on that product instance for the client.

If you want the discount to apply to invoices generated through billable items, you'll need to include another billable item with the same invoicing settings but for a negative amount.

Hope this helps,
Joe