Î guess you want to extend the map border in several directions, room to add more stuff?
The easiest to do this is to create a new map at the larger size in the same style, open up the old map in a second instance of CC3, then use the clipboard copy function to copy your old map minus the map border and back ground over.
Comments
The easiest to do this is to create a new map at the larger size in the same style, open up the old map in a second instance of CC3, then use the clipboard copy function to copy your old map minus the map border and back ground over.