Current questions and answers regarding the map editor.

I have a very interesting question. Is it possible, and if so, most importantly, how can I make it so that, for example, the entire map is a forest (Elven and Human), and there is a portal, and when a hero enters this portal, they are transported to other lands (let's say, completely demonic)? But please don't suggest using the Dungeon faction. From the above question, the main point is probably how to add a second "platform" (map) to the first, with everything being on one map, or how to use a portal to transport to another map (the most important thing is that everything is on one map in the game)?
P.S. Will anyone answer my previously asked questions? Because, as far as I understand, you already know everything about this and are well-versed in it. :(