We are getting ready to update our website.  This will mean not only new graphics - from our people - new fonts, etc., but likely significant reorganizing of the way sections of the site are laid out.  Can we have a process, like setting up a duplicate of the existing website, developing on the duplicate, and then disabling the original site and enabling the new one when it's ready?  I see nothing like this in place.

I created a second website and used the import tool, but it apparently only functions to import styles and master layouts - exactly what we're planning to change - and none of the content.  Our content will remain primarily unchanged, or somewhat updated.  It's the styles and graphics that need to be edited for a new site look.