I'm just?getting started on all this but from what I've been reading here I'm not sure if I can get things to work the way I want.? My main group is for the senior community where I live, a CCRC for those who know what they are.? I would like all members to get announcements?of general interest but expect most of the activity to be on the subgroups?organized by continuing interest groups.? I don't want members of the main group to get any subgroup messages unless they are also subscribed to that subgroup.? Is that the way things work by default or am I going to have to change some default parameters? Do I have to tell people they need to subscribe to the main group before they can join a subgroup?