Splitting a route into parts?

Is it possible to split an existing route into parts?

For example, the C2C is already an entire route (https://cycle.travel/map/journey/75), and I can save it to my routes and then drag points around to take in my planned stops / detours. But it would be handy if I could break it up into days (so my GPS unit tells me how far I have to go that day, rather than taunting me with the distance to Sunderland on the first morning...); is this straightforwardly possible?

Send to Garmin Connect bug: changes route

I have a route with a loop in - https://cycle.travel/map/journey/382388

If I try and send it Garmin Connect, then it turns it into a straight there and back (Girton to Wistow and back), rather than the loop in the route.
If I just download the GPX track and then import it, the route is correct.

[android device, firefox]