Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding General Tops to walls, automating/grouping

So if I make a series of walls automated with

[b]2m_Humans_Prison_A_5H[/b] (for example)

and I know that I can line the top of it with

[b]2m_Humans_Prison_A_Top[/b]

How can I automate lining the top of the wall? Do I really have to go round and put a top on and follow the wall or can I automate another level, or somehow group these two building objects together so they combine?

Thanks. (Finding the Engine really great to use)