This request comes in many different shapes, everyone want to filter subcategories of some particular category in Revit, and so far that is Totally impossible.
I wanted to be able to hide (all but x) interior edges of floors. (So far I need to draw all the one I want to see by hand)
Here are some other examples for other categories:
https://forums.autodesk.com/t5/revit-ideas/enable-to-filter-wall-sweeps-currently-only-enable-to-con...
https://forums.autodesk.com/t5/revit-ideas/separate-v-g-categories-for-structural-and-non-structural...
There are many more... Please implement this fast.