How do I transfer entire map with terrain included from one game to another

So, I am trying to transfer the terrain with the city built on it from one place to another (I want to transfer from a building place to the main build of the game basically). I ONLY want to transfer that portion of my game, meaning I do not want to publish to another place since that would reset the data stored in the other place. Is there any possible way of doing this without having to reset the data from the other place?

I found this, transfer terrain to another place.

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