How do I add invisible mask for multiple sprites?

Hello,

Is it possible to have an invisible mask for multiples object?

I know that it's possible to hide some part with a Layer with Force Own Texture to yes and a background behind with Destination In/Out, but in my case I didn't want to have a BG to hide some objects, I want my mask invisible.

Like this :

Don't know if it's possible...

I think what ur trying to do is same as what im trying to do, i rlly hope some one can help us figure it out, and hey btw have screenshots of ur game?