Hi billndarth,
One thing I would like to add to ninth_waves's post above is that, since these listings were originally created directly through eBay, they will probably not be present on your "Saved Listings" page already. If this is the case, you will just need to redesign each listing using Auctiva's "New Listing" page and click the "Save" button before preceding with step 1 of ninth_wave's instructions.
-Mike