Share a BOM URL with a colleague and try it out! Or simply open a BOM in two windows to see it in action.
One note: currently only the owner of a BOM is allowed to make edits. If you're logged in when you create the BOM, no one else will be able to edit it. However, if you aren't logged in when the BOM is created, anyone you share the link with will be able to edit the BOM.