Duplicate maps

Aha, thanks. I see how it edits the other maps too... I am just getting to the point in my hack where I need to start handling maps, so this is all new to me. I guess I really need to pay attention to what I change and where... Just out of curiosity, has anyone been able to expand the number of maps yet? Most things in the game can be expanded by moving stuff around, but its normally quite a hassle and removes the ability to use editors, but it may be worth it. Perhaps I could build a custom map on a dummy ROM then copy the hex into a new location then expand the map pointer list? I need help from our mapping gurus... What are the limits!?