If you want to add a user to all of the components in bugzilla, you don’t have to go through the gui. In fact, you can change just about anything in bugzilla by connecting to the database directly and modifying the tables. I find this much faster than repetitively navigating through the web front end. Connect to the database, match up user id’s to user names, figure out which components you want to modify, then update the component_cc table. Step-by-step.