Viewing SketchUp model's layer vs object in model tree?

All, 

I am a Tekla BIMSight transfer - and now use TBC - much easier, better, etc.

In BIMSight I was able to change the model tree sorting from objects to layers. That was nice because folks could turn ff layers or groups of things that had similar meaning or intent to remove them from the view. I can't seem to find this functionality.  For example, if I have a skethcup model full of objects, they aren't grouped by phase (or layer), so turning things off and on in a way that reflects their intended assembly becomes, difficult.

Any thoughts on this?

Thanks,
Mike