What I want to be able to do is easilly know if a category is a system or loadable. This is because I want to be able to get materials from elements, and for loadable families, you need to get the materials from the sub categories. So I want to split my elements up based on system and loadable in order to do this.
Ie. if I want to get the material from all elements in a curtain panel (loadable) I cant just get them by calling materials, I need to delve into the sub categories and find a material through that. So it would be perfect if I could simply just be able to see if an element was loadable. Otherwise I can easilly solve it by just writing a list of items I know are one of the other and sorting them.
It feeds into this topic here resolved previously:
Hope this makes sense.