I'm new to the forum, so the subject has probably been handled. The way I break connecting lines between two downloaded tracks is to expand to level 16, higlight a connecting point and do a Ctl-B, then go to the other end of the connecting line, highlight a connecting point and do another Ctl-B. Then that segment can be removed with the delete key.
I have a problem, which is the reason for joining the forum. I've seen some answers which are close, but not specific, and it relates to downloading an existing track to my basic e-Trex. I get the file transfered message, but there's nothing there. I can successfully transfer a track from the e-Trex into a draw or track file, but I'd like to know how to get that track back into the e-Trex at a future date so I can have it in the GPS to follow.