is it possible to have a subsurfaced mesh but still have sharp corners and edges? im asking because a piece im working on needs smooth, rounded surfaces and hard edges in the same mesh.
You can use creases (shift+E) but they don’t always work very well. (To use them, select the parts to want to have a hard edge and press shift+E) You can also add more face loops or knife cuts to harden it a bit. There might be other ways, but that’s all I can remember at the moment … good luck! 
thanks, it works wonderfully.