To reorder the class list, right-click and click Move up or Move down. Alternatively, you can press + or -. Also, when adding a class, be sure to add it to both the class and geometry tabs.
To remove a right-pane row, delete all values.
If you add a property name that does not exist in Plant3D, a new property is added.
You can override a global mapping by specifying a different mapping at the individual class level. The specific class mapping (for example: ConnectionPortCount set to 3) takes precedence over the global mapping (ConnectionPortCount set to 2).