Thank you Steve, now this is clear to me.

What I’d like to do now is to place a custom post type as a submenu of an existing admin page. I found an interesting thread about this:

http://stackoverflow.com/questions/21927445/wordpress-admin-when-placing-a-custom-post-type-as-a-submenu-of-a-parent-menu

I wonder if Piklist includes a scenario like this and how can I develop it.