Page -> Merge Child Pages
The merge feature allows you to merge all child pages of an existing page.
Simply right-click the parent page and select Page -> Merge Child Pages
This will create a new page at the same level as the parent whose content is the
composite of all child pages. The child page content appears in the merged result
in the same order as the child pages appear in the Notebook outline.
Text similar to "(Merged 1/24/2014)"
will be appended to the end of the merged
page name. The date, of course, will be the current date when you merged the content.
As always, you can easily rename the new page if desired.