How to join a region of topography that was previously separated from the topography? I separated the area of the land on which the architectural project will be carried out, from the rest of the topography so that when I change the contours of my terrain, the contours around the terrain do not change. It happens that I want to modify the region of my land, and the problem is that I can't unite the region that was previously separated with the rest of the existing topography of the surroundings (I reasoned that I need to unite two regions so that I can redraw the area that will be separated again ). Can someone help me ?
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