I know what I am asking may not be possible, but I will ask anyway, maybe I will get lucky, and someone else is doing it. 

My business is based on special orders only from various online stores. When I send a quote to a client, I generate a separate quote for each item. In the quote, I have custom fields where I enter the item description and the item URL. 

Is there a way I can add a custom image field where I can paste the product image? I know I can put an image on the item, but if I do that, I would end up with thousands of items' code. All my item codes are "Service" type.

Thanks