@Nick-Carthew Hi Nick, thanks for your reply.
Yeah, it's a fix or workaround of sorts, but not exactly what I'm after. I'm assuming that what you've done there is to copy the route, you've then modified the copy, and then "added" it to the original route so that you get a superimposition. Largely academic for my purposes, but the problem I see with this function of adding a route to a route (for me) is that because black is darker than blue, any part of the blue route that is shared with the black route, becomes invisible. It's not obvious, for example, if the blue route is west of the blue line, or east of the blue line
If the answer to the following question is YES, then the rest of my post is (partly) irrelevant: Can you toggle between the blue route and the black route individually? If so, that would be a half way solution to my idea, but still clunky.
If the answer is NO.....
Then other than obtaining a global view of a tour as a whole once a series of routes have been planned for each day, I don't really see much point in the ability to add a route to another unless you have the ability to toggle each route on and off. So I'd have three ways of seeing the route: The black route only, the blue route only, or, as in your ilustration, both together.
What I'm really after is the ability to toggle a section of a planned route on and off by disabling certain waypoints so that I can instantly compare distance and time.
So, a perfect illustration of this; using your map above, would be to disable waypoints 6 - 9 (black line) and leave the blue line with the rest of the waypoints intact. I would then eliminate the waypoints that connect the blue line (none on your map) and re-enable waypoints 6-9. Instantly I'd be able to see the difference in time and distance all on the same route.
ride safe