Hi Smaul,
Thanks for contributing to our forum. Ebay actually did away with the "store format" listing type that was offered in the past in favor of simply offering discounts on the insertion fees for fixed price listings to eBay store subscribers based on their respective store subscription levels, so you will just need to post these items in the “fixed price” format.
As you post items in the “fixed price” format through your Auctiva account, you should be charged the insertion fees that are associated with your store subscription level as described on the following page of eBay's help index: http://pages.ebay.com/help/sell/storefees.html
Also, as I expect you are accustomed to, all of your active eBay listings should show up within your eBay store regardless of whether they are posting in “fixed price” or “auction” format.
I hope this clears things up. If you need any further assistance with your account, please feel free to contact our Customer Support team by mousing over the “Help” tab and selecting the “File Support Case” option.
-Mike