Refinery adding additional page parts

for all pages if you want to add additional page parts go to config/initializers/refinery/pages.rb
uncomment  # config.default_parts = ["Body", "Side Body"] and add additional page part such as
 config.default_parts = ["Body", "Side Body", "Middle body"]


Changing Page Parts for a single Page

go on to the same part config/initializers/refinery/pages.rb
uncomment and change the following value to true
# config.new_page_parts = false
restart server
now go to your pages tab refinery and edit your home page You’ll notice a plus and minus button at the top right of the visual editor. Click on the plus icon and add a new page part titled “Middle Body” and click save. If you have modified your home.html.erb file, you can use the following snippet to output the new part’s content in your page:
<%= raw @page.content_for(:middle_body) %>

reference URL:
http://refinerycms.com/guides/changing-page-parts