The reason we don't support sub-groups, is that groups can have different access levels and managing permissions would eventually become hard for the community managers. We are looking to improve how you can create relations between groups to create a better structure within your community but they would actually be separate groups that users would have to join.
Where am I?
In Tribe you can ask and answer questions and share your experience with others!
I've created a book club using the Group feature and would like to topics, such as chapter one, chapter two, etc. I'd ... it also appears in the Topic list.