You can duplicate a page in GZCMS by logging in to GZCMS, navigating to the desired page that you would like to copy, opening PAGE EDITOR, and then selecting the dropdown menu from the top left of the page.
From the dropdown select DUPLICATE LAYOUT.
On the resulting page, give the new page a title and select the permalink menu from the left and enter in the URL slug that you want the new page to utilize.
Once the page has been published select PAGE EDITOR to begin editing the page.