I tend to create fairly complex ground units and formations in the name of realism and re-use them the most part from one game to the next. I find myself spending a good few hours re-creating them all from scratch every time I start a new game.
It would be great to be able to export the ground unit types, formations, and organizations from one game and import them into another game. If it could be done at the start of a new game and only make the pre-imported unit types available once the underlying tech has been researched, it would be a life saver.