I still don't quite understand how task groups and fleet organisation fit together. I've got Fleet Headquarters, which has Expeditionary Fleet under it, 1st Fleet under that, and finally 1st Battle Squadron under that, which actually has ships assigned to it. When I build more, I can create 2nd Battle Squadron, also under 1st Fleet, and attach ships to it.
But what if I want to give orders to 1st Fleet as a whole? So far as I can tell, unless a formation has ships directly assigned to it, I can't issue it commands. What am I missing?