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What do you mean by transfer, are you trying to merge 2 map files?
I think I'd do that by turning one of the two maps into a prefab, and then pasting it into the other file. Do mind though, if you're gonna try to align the second map nicely, it can be quite demanding on your system to move so many things at once.
If you're saying you'd like to turn a game level (.bsp) into an editable map file (.vmf) you'll probably want to use BSPSource. Decompiled maps are not perfect replicas of the original VMF. If you want to edit a map from an official title, try googling the map first, most are available decompiled online. ( they will still suffer the same imperfections as they would if you decompile them yourself, but it saves you a few steps )