That doesn't mean it's impossible, but it does mean that, if it is possible, creators making CC not based on the object they cloned haven't taken the trouble to figure out how due to the lack of a simple method.
In my quick look I didn't see any CC that seemed likely to have been hand-categorized. Tudor, Island) had very little (things that were obviously cloned from pack objects with that style). I went into the game to see whether any of my CC was categorized this way, and what I found was that base game styles had a lot of CC in them (things that were cloned from base game objects having those styles) and pack-specific styles (i.e. I imagine it's possible to look at EA objects and do something with this by coping the info from an EA item that appears in the correct style, but I couldn't explain to you exactly how. If you go to Warehouse, and look at the Object Catalog resources, you'll find an entry labeled 'Styles' in there which is probably what you're looking for, but like most things in the Warehouse tab it hasn't been made into a nice simple GUI.
S4S doesn't have anything for that in the Studio tab. plants showing up in Clutter or vice versa), it's this: Decorating style isn't where things appear in the catalog (i.e.
