Sales Category Graphics
You can upload images for sales categories, and those images can be displayed on invoices based on the sales category tied to the invoice. Go to Admin -> Billing -> Sales Categories. Click the link labeled View/Upload/Delete - Graphic For Invoice. This image will be used in place of the company logo on . This can be useful if you have a slightly differently branded logo depending on the type of purchase a customer makes. You can assign the appropriate sales category to the customer and invoice (the invoice will use the customer default), and then a different logo can be displayed on the invoice rather than your standard company logo.