Open the Room you want to manage.
Select the Plate you want to duplicate, right click and select Duplicate Selected Plate from the drop down menu.
The Plate will duplicate and be added to the bottom of the list. The duplication will also copy the instances that the plate is a member off.
Update any of the duplicated plate details as required.
Click the Save button to save the changes to the room.
The Room Saved dialog will confirm that the changes have been saved.