I've just learned you can see climbs at Garmin Connect when creating (or importing) a course.
Unfortunately:
1) GC gives different climbs in numbers and profiles than my Fenix 7x ... which means it's not tied to a device
2) It also doesn't inform at what mile the climbs starts.
3) It does not allow you to edit de start or the end nor add a climb.
4) the algorithm has no sense at all.To say a minimum at least Climb 2 for sure should start earlier and Climb 4 for sure should end later...