Hi all – CBOX OpenLab is specifically designed so that each site (aside from the primary site) is associated with one group, and each group, in turn, cannot be linked to more than one site. As such, it’s not possible at the moment to pursue the most natural solution, which would be to link more than one site to a group (thus pulling all of the sites’ activity into the single group’s activity feed).
A workaround may be the plugin BP External Group Blogs. The CBOX team supports its own version of this plugin, which ships with CBOX Classic but not CBOX OpenLab. See https://github.com/cuny-academic-commons/external-group-blogs. This allows a group to “subscribe” to multiple arbitrary RSS feeds. New items from those feeds will then appear in the group’s activity feed. I don’t see any reason why the plugin wouldn’t work on CBOX OpenLab. Give it a try and let us know what you think.
Another option – and this might be what Ed is suggesting – is to designate the site linked to the course group as the “aggregator” site. Then, use a plugin like FeedWordPress to pull RSS feeds from student sites into that “aggregator” sites. These aggregated posts will then appear in the group activity feed for the main course group.