[Radiant] Adding "extended" content to existing page?

[Sean Santry]

> I didn't notice until afterwards that while *new* child pages I create
> under the main Articles page have both "Body" and "Extended" parts,  
> the
> existing pages (which I edited) did not.
>
> I'm confused as to who decides that gets put there, and how, and  
> whether
> it is changeable after the fact.

You get to decide which pages have which parts yourself. If a page  
has only a "body" part, edit the page look for the green-circled "+"  
sign at the top-right corner of the content editing area. Click that  
to add a new page part. In the "Add Part" dialog that pops up enter  
the name "extended" and click the "Add Part" button.

- Sean