@Big-Al-1 With an Android just proceed as shown in the screenshots.
In this specific case it´s all done on the phone ( MRA App and Connected Ride App ) installed on the phone
Open the route in MRA you want to export to BMW App
Choose export and select GPX 1.1 Route, Track, POI and download
Press export
Press open
Select BMW App
3 Options to import will be given ( import two of them)
( Wegpunkte) and Track
Open ( Wegpunkte )
Press the blue button below "LEFT"
Choose from Starting point ( last point here)
You will see the route, including the waypoint name
Press option and enable or desable wether you want to drive on highway or not ...
Done