Top Mall-Fi poster. The T in META42. Formerly with Tangentsoft Parts Store
Sep 27, 2001
No, ExpressPCB doesn't do ground planes, per se. I mean, a proper CAD tool allowing ground planes would be able to intelligently cut through the plane when necessary. You can mimic the effect by hand with ExpressPCB, but it's a lot of work.
Instead of using traces for this, look into the rectangle tool. That will probably do a better job for what you're looking to do.