Shift+Ctrl+Alt+1
Shift+Ctrl+Alt+2
etc
Note: the hotkeys are long but this is how I practice to use: remove from all control groups or also
Ctrl+Alt+1
Ctrl+Alt+2
etc
Since the new civilizations are ready, and the rework of the sea is near, I make a poll for the developers to include it in their list of priorities
there are buildings that I place offensively and other buildings that are the base, with the control group I can choose which buildings I want to produce units, and I multiply that by each type of building: barracks, archery, stables… if it is useful to me .
As well as the reassignable keys if you are not going to use it, it does not harm you in the game, the new civis are already there and the new sea is close, so they could integrate this as a priority as a matter of low priority, I think that aoe4 should overcome to previous versions