If you are familiar with the "one" icon, you appreciate its ability to locate a selected part or feature within a model tree.
So... where is this thing in Creo 3?
So, I'm going to answer my own question. It is located in the right click menu. I would rather have a dedicated icon, though...
Nathan,
Command "One" was available up to Creo 1.0, starting from Creo 2.0 it is Expand (Use Command Search)