I have like 270 files each file have 4 artboards, So I want to duplicate the ArtB(3) and ArtB(4) For 80 times, but I need a script to select the artboards that i need then duplicate them in action to let it work as a bath automatically, So can you help me pleas.
.. can't (or won't) log in to Facebook to see video.
But.. you can create new rectangles where you want them and then convert them to artboard easily.
Just draw rectangles at artboard edges.. select all and group. Make your copies.. then convert the copied rectangles to artboards. Duplicating 2 rectangular groups 80 times is easy.
To make selecting rectangles after creating copies faster, just add an off-color stroke to original before copying. You can then select all with a similar stroke and convert them artboards in one command.
I'd be remiss if I failed to mention, based upon the image in the question, Indesign would be better suited for this task, where pages are easily added/replicated.