Auto-translated
How do you place dead and attacking units in the editor?
If the question is only about adding "decorative" non-fighting units, then it's not difficult. Create a new object in the editor and specify the desired geometry/texture/animation for it... (I think it's already been explained here).
Added 3 minutes later
I recommend reading the FAQ by Jack_of_Shadows! Place the unit, remove the "skirt," and set the desired animation using PlayObjectAnimation(sName, sAnimName, nRepeatType).
You can also create a new AdvMapStaticShared static object, specify the creature's model as the model; in AnimSet, create a new one using the New button, in the properties animations=>right-click=>add=>name=idle00, anim — choose the BasicSkelAnim of the desired animation of the same creature!
Do I understand correctly that this is exactly the mechanic that was used in the campaigns (original, starting with the DLCs)? When mobs on the map could play different animations. Or are scripts also needed there? Especially if you need to create a sequential animation. For example, an Archer shoots, waits, stands, looks around, shoots again, and rejoices... and repeats.