You can sort your items for a specific eBay category.
Be aware that you can only choose a eBay category, and not a personal store category. You can put as parameter one eBay category ID (eBay categories are different for each countries. Please refer to your local eBay website.
The eBayflashseller sort items from one country.
If you have items listed in another country, duplicate and change the country.
Else, if you have an eBay store, use the eBayflashstore, where items are picked up in all eBay websites