Tracing solid perimeter

 From:  fcwilt
12048.1 
Hi,

From time to time I need to make a "hole" in one solid that is the shape of another solid.

Is there an easy way that doesn't involve creating a closed curve that matches the shape of the second solid?

Which is what I have been doing until I thought there had to be a better way.

Though having the closed curve can be useful.

Thanks.

Frederick