How to create an unmovable Button that can generate movable buttons.

Question

Hello, Don't get confused because of the title. Yes, its true that my subject is a little bit confusing, but I really need help for this project. I'm trying to make a fixed or unmovable button that can generate movable buttons. 

I successfully made a button that can generate buttons. But unfortunately when I tried creating a function that can move buttons, It only move buttons that are already declared. 

Need your help badly. Thanks.