Yeah,As JAP said,
but what i wanted to say is check one of the Amnesia maps.
Open it in the editor and look how they did it. { that's how we all did and learned proberly "
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Anyway, open an Amnesia map and look for stuf you like.
Then if you like a part do this :
Click \ select the one(s) you like ->File->export selection-> search YOUR CustomStory folder-> Save file.
HINT: Don't make then as a compound and save... DOESN'T WORK!
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Then easely open YOUR map, File->Import Objects-> look where you saved the one from the Original game, as i said above, it should be in YOUR cs folder.
Open file and there you go,
Enjoy.