You can only send end points, not routes. If you can recreate the same route using multiple end points, send them all to the car as described above by X35ForMe, then put them together by adding them as destinations. You're stuck with BMW's interpretation of the minimal spanning tree between any two points though - which isn't great sometimes
BMW X3 (F25) xDrive20d SE . . titanium silver . . titanium front grille . . 309s . . xline . . xenons . . black leather . . alu trim . . professional multimedia package . . dynamic package . . climate package . . electric seats . . folding mirrors . . servotronic steering . . DAB radio . . business speakers . . sun protection glass . . split rear seats . .