How to Copy -pate 3 layer ( bracket ) ?

Hi all,

I tried to create a script but it was too hard for me. I hope someone can help me with this.

Can anyone help me create the script?
1.I want document (2):copy - paste to document (3).

Close  document (2 )

2. .I want document (1)copy - paste to document (3).

Close  document (1)

3.In document(3). will add my script.

4. Save (tiff file) and create a new folder named "output". This forder is at the same location as the original image.

Also if I open these brackets at the same time. Can it work?

Thanks all !