Components (Item Type)
A Component item type, means that any item with a price of $0.00, or NO price, will be hidden on the printed/emailed invoice, but will still be visible on Delivery dockets.
This is most useful for non-optional ad-ons to an item or items that are part of a package and are not charged individually.
Setup Item Type as Component
Go to Setup > Item Related > Item Types. Click an item type to edit then check the Component checkbox. Any item linked to this Item Type will now be hidden from the invoice printout if no price is entered (or price is 0.00).