If there are no products that will be alphabetically after the wax cotton items, then you can go into the CSSMenuWriter folder and find the $query_ProductMenu variable and order that by ProductName and have it be descending. It should end up looking like this:
$query_ProductMenu = sprintf("SELECT * FROM products WHERE ProductLive <> 0 AND COALESCE((SELECT GroupingID FROM productoptions WHERE productoptions.ProductID = products.ProductID LIMIT 1), ProductID) = ProductID AND ProductCategoryID = %s ORDER BY ProductName DESC", GetSQLValueString($catParam_ProductMenu, "int"));