If your drawings are really circles and not arcs, you can use the extrude command and give them height. If you have arcs or any 2D object you can convert these closed objects into a poly line and then extrude them. If you have circular objects with other circles or objects that represent holes, you may use the region command to convert these circles/polylines into regions and then use boolean operations to subtract, union, or intersect the various regions before extruding.

Mike McGuire
mhmcguire@itt-tech.edu