Hi Diggs
In simple terms, you buy another Masterlink cable of whatever length you need to get from the BeoLab2000 to somewhere covenient to connect into your existing Master link cable.
Chop the plug off one end of the cable. The "jointing" of the two cables can either be done with a Bang & Olufsen ML junction box, or simply using a terminal strip to re-connect the coloured strands in the cable. If you go for the second option, you need to remeber to short the pink and blue stripped cables together. This happens automatically if you use thte proper junction box.
It is important to power off you system BEFORE cutting into the ML cable. Connect everything up then switch the mains back on.
Opman