So i just got cc3, and i want to start working on a campaign world for my dnd group.

First, I want to make a large scale world map that depicts all of the continents. Then, i want to detail each continent in its own map. However, I do not know of any way that i can copy and paste the landmass from the big map to the regional one without the coastlines becoming rigid after enlarging the landmass. I want to keep the natural feel...

So, does anybody know how to do this?

PS. if this is in the wrong section, sorry.