Current questions and answers regarding the map editor.

Help me understand how to create a guard, for example, a Knight with Archers?

I understand. You place the knights, then select them. Next, in the left panel of the editor, you need to find the "AdditionalStack" line, right-click, add, and set the parameters for the additional stack.
P.S. Please be more attentive; that section was only for maps.