How to include an item from the inventory in a document?
When you are on the page to create or edit a document (either an invoice, estimate or packing list), click in the field labeled "or find an existing item ...". Start typing the first letters of the name of your item, suggestions will be displayed, and you'll just have to click on the item you want to add to the document. Your item is automatically added to the current document without having to do additional input.