Go to Basecamp 'help' and select 'Video Tutorials"
They are divided by PC, Mac.
Select the "Routes' video.
In addition you can find helpful videos in YouTube.
Hope this helps. JB
Thank you for your quick reply. Looks complicated!
Do you know if it is possible to create a custom route using Google Maps and import into my Garmin Drivesmart 61LMT-S ?