The Copy User feature prevents an administrator from having to create new FogBugz users one-at-a-time. It allows administrators to create just create one "prototypical" user, then copy all of his/her settings to an arbitrary number of new users.
To get started, go to the Users page (accessible by selecting the "Users" option in the "Admin" drop-down menu), and select the Copy icon in the row of the user you'd like to copy. On the Copy User page, you can verify that the copied user's settings are just right, then enter a list of new users to create, one name and email address at a time.