The functionality is pretty much self explanatory, it allows you to copy categories
You mean to say you want to copy the linked products and duplicate the master products into a new category with one action.
That could be useful for many people.

Meanwhile, you can copy products with this:
https://www.zen-cart.com/showthread....y-Move-Delete)

from
https://github.com/torvista/Zen_Cart...py_Move_Delete