> From: rasmus@gmx.us
> Date: Wed, 1 Apr 2015 21:42:43 +0200
> Subject: Re: [O] INCLUDE heading
>
> Joon Ro <joon.ro@outlook.com> writes:
>
> > I would love to have this feature (include only a subtree from another org
> > file) as well.
>
> You can do this in Org v8.3.
>

Thanks - I'm glad to hear that - in fact I just installed 8.3beta yesterday so I'm good to go. 
I couldn't find  the relevant documentation though - could you please refer me to it? 

-Joon