I'm trying to resolve a similar issue. I have a world map, from which I'm trying to create smaller, regional maps. I tried using the Copy to Clipboard option, but whenever I attempt to paste the contents of the clipboard to a new map template, it does not work. Instead of pasting the part of my map I selected, it pastes some text I had copied much earlier.
I'm actually trying to copy a small section of a very large continent, not an entire continent. I'm wondering if by trying to copy a part of a large entity (the continent) I'm confusing CC3 somehow?
I may just try to create a copy of the world map and delete everything outside of the area I want to detail. Is there any way to select this area and delete everything outside of it with one command?
I hope my questions aren't too arcane!