I feel like this is probably a dumb question with a very obvious answer, but how do I take a formation out of its parent formation? For example, if the 42nd Battalion is parented to the 24th Brigade, what do I do if I want it to not have a parent any more? I tried dragging it to the planet, which almost works: the 42nd Battalion is moved to be under the planet rather than the Brigade, but it has no permanent effect. An order to load the Brigade onto a transport still shows the Battalion as a dependent formation, and refreshing the ground units window puts it back where it was.
In principle I could move the Battalion to a different Brigade, but I don't actually have another formation to move it under in this case.