Refering Object Instance separately

How do I...?
1

I’m trying to do this:

  1. Create as many new instances of an object ‘ball’ while dragging the object. [Done]
  2. Make the new instance reach a specific position say (400, 400) by drag and drop. [Done]
  3. When the new instance reaches (400,400), make the new instance disappear without the original object being hidden [Not Done]-Need help with this.