You will have to edit current listings to change the item location, it is not connected to your ebay address. From memory it is somewhere in the postage section (I list with TL). You may be able to use the bulk editing tool. You will not be able to change any items that have bids on them but you can add a note at the bottom of the listing.
____________________________________________________
It says in this book I am reading that by 2065 80% of women will be overweight.
See what a trendsetter I am?