Ok think I know what you are saying.....
When you create a category in ebay you need to let auctiva know the new category if you go to ...My Account then....Settings.....then ebay settings....Then update store categories from ebay....and bingo all the categories you have made in ebay are now in Auctiva....so when you create a new listing you should have the choice of ebay categories you have created....Hope that makes sense..Good luck.
Paul.