I'm trying to print a viewport on a different plot style than the rest of the drawing. I noticed that in a viewport's properties there is a "plot style" section, but its grayed out and won't let me change it from "by color".

The Plot Style setting controls the Layout, not the viewport.  So you can't control things that way.  But you can do a work-around.

Let's say you have a Layout tab with two (or more) viewports.  One of them you want to print with colors.  The other one you'd like to print in black and white (monochrome).  Here's how I'd do it:

Set the Layout Plot Style to acad.ctb or one of your own that includes full color.  In the viewport that you want to plot B&W activate it (double click inside to enter model space) and open the Layers palette.  Modify all the layers VP Color setting to Black.

When you plot this Layout now you'll have one viewport in color and the other in B&W.  It should be easy for you now to use this idea to get what you're after.

Dave.



Edited by heinsite - 25.Oct.2012 at 08:11