Nuvi-Nebie,
Thanks for the clarification about Tracks and Routes made up as a collection of Lat/Long waypoints in BaseCamp.
I am now able to successfully create a tailored map within Google Maps, create a .GPX file with the "Maps to GPX" tool, import the file into BaseCamp, examine the resulting Track file, edit it if necessary, create a "Route" from the Track that I can then send to my DriveSmart 61 which is automatically downloaded into my Trip Planner trips. When I examine the resulting Trip I notice that the route is composed of the same number of Lat/Long waypoints created in the BaseCamp route and the Step-by-Step instructions faithfully follows the original tailored Google Maps route.
I am very happy I can finally do this as I was having trouble trying to create a custom route directly using the shaping option with Trip Planner itself. Sometimes I would have no problem touching the screen over a specific road on the map and adding it as an intermediate point to shape my trip. But more often I would touch a road on the map and get a message like "Invalid Location" which is clearly not correct. The whole process was a bit cumbersome anyway by always having to drill in enlarging the Trip Planner map to find a specific road I wanted to travel on only to get that annoying error message when I touched it. Now I can do all the customizing within Google Maps which is quite easy by just dragging the track onto a specific route then creating the appropriate .GPX file.