It would be convenient to have the ability to share a group to another group. For example, I have a group (group A) set up to support a collaboration workspace. I want to share all of the content from a different group (group B) to group A and I want any changes in the items shared to group B to be immediately reflected in group B. So if I add share a new feature layer with group B, it gets picked up by group A and pushed through to my collaboration guest on the next sync, without me having to specifically share the new items with group A.