If you look at the top of the rev.categories.xml.config xmlpackage in the package tag, you'll see includeentityhelper="true". Any xmlpackage with this will include entityhelper information in the xmlpackage (you can see the entity helper xml if you set debug="true" in the package). This hierarchical data is a bit complex, as well as heavily used within the application, and is assembled in the AspDotNetStorefrontCore project in the EntityHelper and HierarchicalTableMgr classes. You'll need the source code to modify these classes, and any changes will require a recompile in Visual Studio to take effect.
<a href="http://www.aspdotnetstorefront.com">Shopping Cart Software</a>