Select Cutter Point is the default tool guide. When you mouse over an
edge, you see a preview of the bend line and its location. Click anywhere
along the edge to place a bend line perpendicular to the edge across the
entire face.
The Select Two Cutter Points tool guide lets you select both bend line
endpoints to produce different angles.
Click Complete once you have created two crossing bend lines.
SpaceClaim shows the cross break as triangular shaded
areas on the face.