Hi Barry,
Unfortunately, in order to change the listing sites of these items, you will have to recreate them from scratch. Each eBay site has a slightly different listing form so the information cannot be passed easily from one listing form to another.
To recreate these listings quickly, you may want to open your Auctiva account in 2 separate browser windows. Then, you can copy/paste the listing infromation from your saved listings to the new listings with the appropriate eBay site selected.
Sorry to be the bearer of bad news.
-Mike