While in the Publications tab of the Maglr dashboard, click Edit on the publication you would like to duplicate a page of. You will see the publication's information along with the list of the pages that make up the publication.
Move your mouse over the Duplicate Page icon on the desired page you would like to duplicate, the icon looks like two pages, one behind the other. Clicking this icon will duplicate that page to the bottom of the page list, maintaining all the elements, settings and name of that page.
Duplicating a page can mean creating more similar pages, easier. You can re-use all the elements in the duplicated page and still edit them to your wishes.