How to measure of edge for extrude?

[Anonymous]

I want to measure of 2 cm from the edge of a rectangular prism(body) so that I can extrude a piece up that is 2cm away from the edge. Any ideas?

[laughingcreek]

Is this what your asking for?  Here I put a sketch on the face to be extruded from (My perfered methoid is to keep sketches on origin planes and "extrude from"  that surface, but method shown achieves the same result)