Parent categories

Question

I am wondering about the following:

There is a category called Mass Walls, this category has a ParentCategory: Mass The category Mass has SubCategories. But in that list you don't see: Mass Walls

What kind of Categories is: Mass Walls

because it looks like this:

ParentCategory

• ChildCategory

---

• SubCategorie1
• SubCategorie2
• SubCategorie3
• etc...

Answer 1

It appears to be for a GraphicsStyle of the same name and is probably for some internal usage instead of allowing elements to use it.