Is there a way to add subcollectiond in Bridge?

Hey all,

I'm currently doing mundane tasks, so my brain is in rapid fire mode right now but...I'm away from my machine so I can't play around and figured I'd ask a few questions and start a discussion.

Playing with my workflow I recently discovered "Collections" in bridge. I love it because I can sort images in separate folders the second I pull them from my camera while still keeping them in separate folders and not having to create a wildly intricate shortcut tree in Win explorer.

So..my question: is there a way to create primary collections and then subcollections?

I.e.:

Live Music

— Bands

—— Band A

—— Band B

—— Band C

—Venue

—— Venue A

—— Venue B

—— Venue C

I know you can do something like this is Lightroom, but I'm still learning in Lightroom and am not looking to moving over completely until we can batch export to PNG. (If we can with the latest update PLEASE let me know).

Also wondering if there's a way to display images that belong to multiple collections.

I.e.

All images belonging to: Live Music, Venue A, Band C, Year X

And no others.

Does that make any sense?

As usual: any and all responses are GREATLY appreciated!

Thx

K