Right now even if you were to inset those polygons before extruding inward using the method I pointed to by EarthQuake, you would probably still need to start off with a few extra edges to maintain the overall roundness of your large cylinder shape just like in EarthQuakes' example.
Thx @ Apuna alright so I kinda get how I can do it... but now I have another question If I were to have inset the polygons before extruding them inward, and then cut the controls like in your examples, would it be ok still? or do I need enough sides to accommodate the controls as well? I'll try it next time I hop on the…