Insert Hanger
To insert a hanger on a conduit or cable tray, go to
Ribbon: 
Insert Hanger
Pulldown Menu:
You will be prompted to select a point on the conduit or cable tray where a hanger is to be inserted.
Select conduit or cable tray at location to insert hanger:
A hanger will be inserted at the specified point. The location of other hangers will be adjusted based upon the newly inserted hanger.