Hi Snow,
Yes. You need to import your Store Categories to Auctiva first. Go to: My Account>Settings>eBay Settings>Update Store Categories From eBay. You will need to do this every time you change or add a Store Category in your eBay Store. After you update/import your categories, there will be a drop down menu with your own store categories under the eBay category list when you create a listing. For the listings you have already sent to eBay, you will have to manually revise each one in eBay. Good Luck.
Doug
My eBay Store
My eCrater Store
Cash Back