Procedure for Duplicating PCB is explained below
Step1: Load project and open Fabrication Manager
Step2: Select Setup from Fabrication Menu
Step3: Change the Number of Horizontal steps and Number of Vertical steps in to required
Step4: Select Gerber Artwoks → Set to Used → Execute → Execute
You can view the panelized board from Fabrication Graphic(Gerber/Excellon/DXF/HPGL) Viewer
& Import by importing gerber files to corresponding layers.