Editor split scene

I want to create a huge scene and then split them in different scenes(in the editor, not during gameplay), how can i do this? Is there any way to copy an area of one scene and put in another scene? The way i’m doing this now is not optimal.

If you wanna split terrain then you can’t.
but for all the rest, one way of doing it is to group all the things you want into one prefeb, then that prefab sits in your assets and you can put it in any scene you want.