Secondary outliner that doesn't affect model heirarchy

[superpowers04]

Detailed description of your suggestion

It'd be cool to have something like another outliner that you can reorder parts in without messing with the model heirarchy. Currently if you have a model that can have for example, several different types of clothing. Whenever you want to toggle a specific piece of clothing.. say a shirt, that's spread across a model, you have to manually look for every group/part associated with the shirt and toggle them individually and if you decide to store the shirt outside of the model, then animations won't apply to the shirt. It'd be cool to instead be able to have a Clothing group with the shirt inside it for example, then you can just toggle the shirt in one click and it doesn't break any animations or model heirarchy.