Current questions and answers regarding the map editor.

Which creature are you planning to replace?

There's no need to change the creatures' properties. I simply copied the city file from the resources to the map. I placed this city on the map. The city properties contain a list of buildings. The building properties specify the creatures that can be recruited if it's a dwelling. That's what I changed. For example, I decided to place an Academy city on the map, where archers, crossbowmen, and marksmen will be recruited instead of gargoyles. In the files for the stone parapet and obsidian parapet buildings, I replaced the gargoyles with archers. But since I copied the files for these buildings to my map and specified them in Shared, i.e., I didn't change the properties in the resource files, this map doesn't affect the others.
Here's a screenshot: