How to do make mysite.com/post-name/sub-post?

You could create a custom post type and set hierarchical to true, but keep the post capability role. The link below is a good starting place.

http://codex.wordpress.org/Post_Types

Although I would strongly recommend using some sort of javascript html css workaround. Maybe a jquery ui tabbed interface located inside of your single.php theme like “http://www.mysite.com/post-name/#video”

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