To remove a hanger from a conduit or cable tray, go to
Ribbon: DM Electrical->3D-BIM-> 
Remove Hanger
Pulldown Menu: DM Electrical->3D-BIM->Remove Hanger
You will be prompted to identify which hanger is to be removed.
Select hanger on conduit or cable tray to remove:
Not all hangers can be removed. If the selected hanger is necessary based upon the spacing requirements set for the conduit or cable tray, you will not be able to remove it and the dialog box shown below will appear.
