I know there are lots of tutorials out there on this subject now. But back in 2007 there was not as much full information on subdivision surface modeling. Most of what I learned was from talking to other artists and observation.
in 2007 I wrote at tutorial for LightWave that has now shown up here:
Ben asked me for the files so he could add it to the docs for LightWave 2018. He was also the guy who first requested that I write the tutorial for the LightWiki. It is a tutorial that has been at the mercy of whoever was running the LightWiki and it went down and changed hands several times over the years.
So if you’d like this updated to current times and also translated to Blender, please say so and of course subscribe to my channel.