To Duplicate your buttons

 

• Right Click on the button you have created in your Library window and select Duplicate
  
• Drag this new button copy to your main timeline onto your buttons layer.
• Add a new unique instance name for this button in your properties window (ex: Taco)
• Copy and past ONLY these three lines of code (highlighted below), changing the instance name to match your new button, the rest remains the same as your other buttons (in-out etc)