Connect the BeoVision 7 and the BeoSound 3000 with an ML cable to each other.
Connect the speakers to the BeoVision 7, BeoLab 4500 as front speakers and the Beolab 3000 as rear speakers.
Put the BeoVision 7 in option 2 and the BeoSound 3000 in option 0.
Optionally you could buy a BeoLink Passive (T 1656). Connect it with ML to the main room and connect the Redlines to the BeoLink Passive.
Now you can listen to music or watch a DVD in the bedroom.