Nesting or Collapsing Customized Pages on Menu

Currently our Home Page has the Menu Structure seen below. I would like to do one of two things with the Customized Pages labeled Photo Gallery:
Nest them under a general Page called "Archived Photo Galleries" or compile the contents of all prior year Pages into one Page called "Archived Galleries" I tried copying the contents of two individual pages into the page called archived and on the next attempt to copy another page's contents got error message page full cannot exceed ...

Is there any way to accomplish what I hope for?
Current Menu Structure
Main Menu
Home
Meeting Information / Directions
Contact Us
Meet Our Members
Club Calendar
Public Downloads
Free Resources
Toastmasters Video
Photo Gallery 2013
Photo Gallery 2014
Photo Gallery 2015
Photo Gallery 2015 Continued
Photo Gallery 2016
Archived Photo Gallery

You cannot change the sidebar menu other then the choices in the Admin console.

You can however make pages unlisted and link to the from another page, i.e. page called gallery, and have the links to the 5 pages on the gallery page.

Please read the documentation on this site.
support.toastmastersclubs.org/doc/item/custom-pages

Please always enter your club name and number if you want assistance. We cannot help you without it....