Once your online you will choose your armysetup and than get to the battle.
You probably know about grouping you units, now there are two ways:
1. the easy known way - ctrl + 1-9 to select the group, than you have alt + 1-6 to set a formation
If you have done this, you can select the groups by just hitting 1-9
There is one problem, it doesn't let you group single units, such as your general who you want to move solo.
2. There are 4 Keys which let you select solo units - F1-F4
It works same as the hot-keys: select the unit and hit ctrl+F1-F4. Than after you can select the units by just hitting F1-F4.
Here is a small video, how its done:
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