As an HVAC and Refrigeration contractor it would be a great idea to show equipment that was worked on customers invoice. The equipment that is imputed at customers location should have the option to be shown and printed on invoice as perhaps a "Insert Values". Information as Brand, Model, Serial, Id, ext. The way Im doing it now is i had to create custom fields and added to invoice. I cant tell you how much of a hassle it is to always input the information for every job it is, when equipment information is already stored in there file. I think not only helpful for the HVAC businesses but perhaps plumbers, Appliance Service businesses, Electricians, or anyone business that are using the equipment option.