Not the Era 100’s.  The Playbar cannot use Era 100’s as surrounds, they are too new.  Are you currently using One SL speakers as surrounds (it’s not clear from your post)?  If so, your surrounds are already maxed out, you can only have two. 

The Sub-Mini should work with the Playbar. 

Hi,

Thanks for the quick response im currently using the One sl as a kitchen speaker and my playbar for tv.i wanted to have the playbar with sub and 2 speakers behind me just wasn’t sure if it was possible 

It is possible, but you would need to find another One or One SL, which aren’t being manufactured anymore.  There may be some out there, certainly on the used market.