CADWorx Structure tab: Tools panel > Cut 
Command line: SCUT
Cuts members at specified points or along a plane based on three selected points. The software updates the length, weight, and other affected properties of the cut members. You cannot cut plate members with this command.
Point
Cuts the member at the selected point.
Plane
Cuts the member along a plane based on three selected points. The software then asks if you want to delete the cut section.