Have someone used the widget Gallery Filter 2.0? see here
NEED ADVICE. I was thinking about using it, but before buying i need to know if it's possible to create sub-categories inside each filter?
Best way if you ask the vendors themselves, they should know their widget.
I guess there´s no sub-catagory option. It´s not a real menu like the menu from muse.
Be happy if it really works responsive (better than the same from muse-themes.com).
But check on different browsers first.