Currently this is not directly supported. As Dave mentioned, the backup and restore feature can be used to achieve a similar behavior.
We have this on our list of possible future features.
Falagar,
The way Basecamp is structured it is just too easy to lose important data while experimenting with different routes. Backup/Restore is a clumsy alternative.
I don't use BC-Win that much ( mostly BC-Mac). How do you easily lose data while "experimenting" with routes?
Cheers,
When deleting an experimental route, if you're not careful, waypoints used to create the route also get deleted.
I've got 4 different My Collections. Backup BaseCamp with your choice of names. Clear everything out of My Collection and build another one. Backup that one. To use one of them, Restore it.
Don't forget to Backup a collection anew when you make changes before you restore another collection.