There isn't anything set up to catogorize different types of tracks. Also, only one logbook is really supported, though you could easily copy the file in and out to swap them.
If you right-click on the gpx file and go to properties, then go to the "track points" tab you can see all of the points data, you can select and delete specific ones. If you double-click on them the main window will center on that point. In 'point' mode you can move and delete individual points. There shouldn't really be any need to look at the GPX file directly