Share Products in Ultimate

I have 5 Ultimate stores running. All are sharing the same products and categories. I did this when I initially created each store.

We recently tried some new products on one store and would now like to copy all these to the other stores. It involves about 100 products and 10 new categories. I cannot find an easy way to copy these categories and their products to the other 4 stores. I know I can do them one by one, but there has to be an easier way to copy categories and products between stores?

Any help would be appreciated.