When creating a lead, you might have to add an item that isn't in your inventory or add a note that needs to display with your items. You can do this by using the Quick-Add search bar.
With the Quick-Add search bar, you can search for items in your inventory and also add items to the event that aren't in your inventory. To Quick-Add items you'll write the name of the item in the Quick-Add bar and then click "Update".
This feature is useful for adding notes to your line items and also adding one time items to a lead.