The new Stair and Railing Tool include GDL sub-elements. Many of them are pre-defined and available by default, through the element and component settings dialogs.
To create your own sub-element, you can create and customise an element and save it as a specialised Library Part.
Let's use this option to create a Loop Fence.
Create the custom Post:
Create a Railing to use the Post:
This procedure only creates the 3D geometry of the custom Post. Find out how to create a 2D Symbol here.
It is best to save the Railing as a Favorite to be able to use it in other Projects as well. How to do that? Find out more here.
Check the ARCHICAD YouTube Channel for tutorials about the Railing Tool and the Stair Tool.
Is there a way to have these custom posts/panels etc be visible on plan as projected?