What sort of controls are they? If you have dimmers in your racks which are assigned to the worklights, then you can simply patch the
DMX channels (usually the
dimmer numbers in this sort of setup) to a
channel on your control
desk.
If this is simply a light
switch on the wall (the work lights are
fed from your building light
power), then you would need to get a large enough
relay module in the
dimmer rack, and pull
wire from the rack to the
switch.