I’m trying to figure out how I’m going to make a hole in the surface on the side of the main cylinder. I want to use the Subsurf modifier and have everything still rounded. Are there any good ways of achieving this?
MyAttempt.blend (905.1 KB)
Hello!
This is a tutorial that really helped me when I struggled with this:
I hope this helps you as it did me.
There is no problem with the other parts, but I think the marked part will be quite tricky.
There seems to be a video that can be referenced among the videos in the link below. (There are no same conditions)
After seeing the tutorial video in the comments and the other screen screen shots I made this. I did change it a little but all of the comments helped 
MyAttempt.blend (897.8 KB)
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Glad to see that it worked out. 