There is one plugin I install on every single site I every work on.
It's this one.. Duplicate Post!
It's so useful to be able to create new pages and posts from existing one. I don't know why they just don't build it in to the WordPress core.
You can use this plugin to create an exact copy of a page or post, or you can use it to create a new draft from something you already have.
A must have on every site.
Hope you find it useful too!