Customize wall int/ext

[Ronarc]

Hi I m new to AC and this forum so please bear with me… I want to draw an internal wall 250mm thick. I’m trying to copy the preloaded generic 110mm wall but can’t figure out how to create a new generic internal wall that’s 250mm from the 110mm template or from scratch. 
Similarly I want to use a 250mm generic wall for the external walls so I would copy the parameters of the internal wall to make an external wall out of it. Any help is much appreciated, thank you 🙏  

EDIT

I found Composites Edit tool, I think that solves my problem 

[Barry Kelly]

Yes, the composite editor is where you can create new (or duplicate) composite walls (can be a single skin or multiple skins).

If you just need a single skin wall you can use the 'Basic' geometry method rather than a composite.

I prefer to use composites, even for single skin walls.

Barry