Craig,
You will need to connect the Beoport to the Masterlink, a junction box is best and they are quite cheap. It should be noted that there are two types of Masterlink junction box, the expensive one which has sockets all around it and a small type where you actually connect the wires with a tool.
I am assuming that your Beosound 3000 and BeoVision 3-32 are already connected together via Masterlink and I guess they are in the same room ?
You will need to check the software revision of the Beosound 3000, otherwise you may not be able to use N.Music or N.Radio.
Are you planning to put Powerlink speakers on the Beoport ?