Project Tree, Multi Project, Sub Project
A project of a group of other attached projects
Create a project and be able to link projects together either in a related topics way and or a tree link where you have a parent project and children projects.
One idea is a parent project of royalty in history and children projects of each royal house or dynasty. This could possibly help in clean up of merge issues as well.
I have one project I would like to start for Volga Germans and have children projects of each village within.
An idea of linking projects would be wars/battles fought throughout history being able to link them into a category of some sort. You could then take this and even make sub projects for specific battle locations.