Specific Unit Selection

This is a simple idea, but I Think it would be very useful, the option to choose a specific type of units, for example, select all light armor, or all unarmored, or all heavy armor, or all planes, all ships, all subs, etc I think this would help managing or separating Units a lot more useful, especially for maps like HWW. And if possible, maybe even selecting a specific type of unit, this would be a very useful early-mid game tool I think, late game though, you may have units from many fronts so It may not be too useful, but maybe one day they'll add stuff so you can organize your armies by theatres or whatever.