Optional Items on the proposal : the BEST add-on sales tool ever. aka - Selling a security system and it is a package.. I like to give the customer options available to them for the system, thermostats, door locks, door bells, lights, Window contacts, etc.. These options could be placed in a location called optional and just show the price of the product, but do not calculate them into the proposal total. Give us the ability or the customer the ability to add them to the proposal by just changing the location of where it is.