Use this procedure to create a profile from a closed polyline. You can then use the profile to define a custom railing component. The custom shape is extruded from the profile along the length of the component.
The height and the width of the polyline you use to create the profile define the height and the width of the railing component. You can change the scale and dimensions of the profile as you add it.
You can now use the profile to replace a railing component.