From Cadimage Help
Cadimage Stairs ships with a limited number of newels, balusters and handrail brackets. If you have a GDL development resource you can extend the available range by creating your own components. If you like, you can share these with other Cadimage Stairs users by uploading them to the Cadimage World web site.
Example objects are included in the library. To create a new custom component, open one of these example objects and save it under a new name then edit the scripts to create your own component.