Should "Intruding" be used here? I would like to create a sunken area. 


I wonder what would be the best way to achieve this.
Should "intruding" (the opposite of extruding, I guess) be used here?
Scaling would not easily work because the neighbouring vertices would also be moved. I would have to introduce 2 extra ringcuts to avoid moving the neighbouring vertices.

Could anybody tell me the best way to achieve what I want?
Thank you.
I don't quite know how to interpret the image, but here is a possibility:

Switch into edge or vertex selection mode. Press &#9096; CtrlR to add a loop cut through the face ring in question, making sure to slide the new loop all the way down to the loop below it.



Press S and then &#8679; ShiftZ to scale the new edge loop while locking the Z axis to get something like this: