plotting half-tone backgrounds

[Brian R]

For producing a construction drawing that indicates existing or work by others in half-tone or ghost lines, what method is best?

I find with my in-house black and white laser printer, I can use color to translate to half tone, but it seems to change some when I make the drawing into a pdf. Or one can do all the existing on a separate layer and print that gray, with new work and title block as visible, but that takes a different organization, and I might have to redo some of the layer links to add in the grey layer.