I've always used control groups since I started playing CoH. They help me a ton and I've always kept the same system. Going by the streamers I think I use them one of the most. Games that go mid-late game I generally use all of them.
The system I use to organise my control groups is:
Infantry = 1-4
Vechiles = 5-6
Engineers = 7-8
Snipers = 9
The number is also so relevant to the position on the map. So for infantry as an example, #1 is far left, #2 left/center, #3 right/center and #4 far right. This helps me keep a clear hand eye coordination of where all my units are.
![Honor icon](/images/replay/honor_icon.png)