Plotting

Hey, im new to the forums and only have little knowledge of the autocad proram. My question is as follows.

Only so i have 1 drawings that has 3 reference drawings attached. 1 of those 3 xref drawings have its layers in color ( its the Architectural drawings with walls and such) I am looking for an easy way to plot the drawings so that all layers that are in color ( ie that arch xref drawings) plot gray and that everything that is in black plots black. i know that you can go through and manually do this but there are over 300 layers on the arch drawings. I need to do this on about 200 drawings.

Basically i want to be able to take that 1 Drawings that has those 3 xref drawings loaded onto it, and make all color layers come out gray and all black layers come out black when ploting. Is there a way to do that?

Thanks,

-Branden-