I have a group of post types that are in a submenu so as to prevent the admin sidebar from being cluttered: http://cl.ly/LMeJ. I’ve created a submenu named Reorder that spits out links to go to the reorder page for each of those post types. Problem is, when I go to the page, WordPress tells me “You do not have sufficient permissions to access this page,” even though I’m logged in as admin. Whenever I turn off show_in_menu in the register_post_type $args variable, the same link works just fine. Any ideas?
As far as i understand, you created sub-menus for each of the post types within that Admin menu item. But there must be a problem on the way you add those and WordPress does not allow access.
Anyway, as the advanced version does contain that feature, i can say that we changed parts of the code to be able to implement it, practically it works through a single re-order interface. So i’am not sure even if you are going to create and access those re-order menu items, you will not be able to make the sort for that particular post-type.
Hope it make sense.