Shade Smooth Render Lines I want to simply smooth out the circle faces on the object using the Shade Smooth render selection. However, all the faces are affected by the smooth render and I get a stretched lines look to the faces. I tried to select (in edit mode) the required faces I want smoothed out but with applying the Shade Smoother render (in object mode) the whole object is affected by the smooth render. Thanks in advance with any help to resolve this.
Of course you can smooth only some faces.  

Manual way:
In Edit mode, select your faces and go to Mesh > Shading > Smooth faces.
this will only affect selected faces.


Automatic way:
Go to Object Data tab, and check Auto Smooth option.
You can set how sharp edges wil be affected.
Your object needs to be set to Smooth Shading for this to work.


You can still manually mark edges you want as sharp.
Just select your edges and go to Edge > Mark Sharp.