Charlie,
You can delete just the channels or the entire TP with the remote through the menus, however, if you do so it will only delete the items from the "working file". The backup file will still retain these channels / transponders and this can create some conflicts in the future. So, there is a more appropriate method.
Use ACC 1.1 to upload the dat files from the AZBox to your PC and save them, close ACC. Open these files with MaZEdit and delete the unwanted channels and transponders and save those edits, close MaZEdit. Then, reopen ACC 1.1 and download the dat files back to the AZBox. This action temporarily sets the attributes of the backup file so that it is "writable" - normally it is "read only". This way, you save the edits / deletions to both the working and the backup files.
Also, it sounds as if your dish may not be perfectly aligned or that it does not have a good adjacent signal rejection quality. It may be a little of both. Picking up signals from both satellites (99 and 101) seems to be a common occurrence. I got a bit of that when I first started out with a 76 cm dish and I had to tweak it to avoid the overlap. When I set up my 1.2 M dish, I didn't notice this anomaly.
RADAR