Help for the Heroes 4 Map Editor.

Hello everyone. Is it possible to remove an army without a hero from the map using a script?

And how do you do the opposite? How do you place an army without a hero on the map using a script? In the sense that a monster is present, a player kills it, and after a certain time, a script places another monster in that location. I hope I explained it clearly? Please provide a very detailed explanation, as I am a beginner.