Higher Command Organisation (could more be done)

[Ricky B]

So this has been around for years, although maybe not since the beginning? From the manual, under hot keys:

O - highlights the Organization for the selected unit. If an organization is
currently selected and you hold down the Alt key when invoking this function,
then the next higher organization is selected.

Although I guess it isn't quite what you want with the HQ being highlighted, but then there is a Highlight HQs selection that could help, between the two narrow it down.