Hi Lilly,
Unfortunately you are not going to be able to do this.
Your Auctiva store is simply a collection of all of your active ebay listings. It will contain all of your auction and fixed price listings and if you have an ebay store all of your store inventory. If it is not an active listing on ebay it can not show in the Auctiva store. The Auctiva store imports your newly active listings directly from ebay and updates current active listings, I believe, about every 6 hours. That being said, if you have no active listings your Auctiva store will be empty .
The Auctiva store is a great free bonus to those sellers who don't have an ebay store and a nice extra for those that do. For sellers without an ebay store it is a nice showcase that you can direct buyers to from your listings instead of sending them to a regular ebay listings page.
How many items would you like to have in the store at one time? A Basic ebay Store may be what you need. Check out this link:
eBay Stores FAQs
Take care.
Terence
COZI COLLECTIBLES