hard edges connected = soft edge

[Fonte Boa]

Maker, try to use the command
Body|AutoSmooth.

It "automatically" turns some Edges hard, keeping the other ones soft,
all this based in a Crease Angle you can set
(to this, right click on this command or click on that rectangle side the command name).

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I found two very old tutorials i've recorded about this:

http://www.youtube.com/watch?v=bNvli3x4JwA

http://www.youtube.com/watch?v=VbzL95LNrWk