Okay, I think now I see what you did there from the wireframe.  You did a partial edge selection, and bevelled it in slightly, to reinforce the edge for hypernurbs (I mean subdivision) smoothing.  I'll have to try this with our bevel tool in C4D.  I've been sculpting in wrinkles with a sculpt brush AFTER subdividing, but that requires more overall density than just reinforcing certain edges.  For this type of effect, bevelling edges makes sense, if you aren't baking in the details.