Hi Guys

I'm making an atlas for a fictional world, but I'm stuck on some technicall Photoshop problems...
I've made several smaller maps to exercise, and now I started on the real project. The idea is to have this world map with several different regions, and then make different maps of those regions and even maps of the countries. I thought it was a good idea to start with making the world map and than select the regions and copy them to new files in which I could add more details...

Now, I fear I dind't think the whole thing true and now I'm stuck. I thought it was possible to use a select tool and then copy the selected area on the multiple layers - in one simple click, but whatever I try, the layers always get merged.

Does anyone have any idea on how I can do this withouts spending houres copying the layers one by one?

Kind regards

Jelle