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I don't know if there's a tutorial. It's pretty easy to do.
Go to C:\Program Files\Origin Games (or EA Games... depending on whether you're using the Ultimate Collection or the game disks)\The Sims 2\whichever EP the mesh is from\TSData\Res\3D (or Sims3D if it's the Base Game)\Sims03. (If you want the textures, too, the adults ones are in Sims08.) You'll need to know the file name to pick the right GMDC, but
SimPE should be able to tell you that (it will be similar to the teen or elder mesh, just with "af" or "am" at the beginning).
I suggest getting familiar with this method, because it's so much easier than messing around with Body Shop and SimPE's extraction tool (which doesn't always find all the mesh parts). Plus, if you get the textures from the original game files, they won't be all grainy from Body Shop compression.