Hotkey Help

Does anyone here know if there is a way on HD to assign more than one building to one hotkey? I had it setup like that before where some of my economic buildings and military buildings shared the same hotkey, there was no problem with it because I would always have either the economic buildings in my display or my military buildings in my display. Recently I got a knew computer and although my HD hotkeys were saved at first something happened and they have been overwritten with the defaults. I am in the process of trying to remember what my old hotkeys were right now and currently there are still a few hotkeys that I want to assign two buildings to the same hotkey (one economic and one military). Any help on this would be greatly appreciated.