Add Art Region from Opening: Art Regions Tab

Click the Add Art Region From Opening button to apply the selected Unassigned Opening listing to the currently displayed image as an art region.

Have the desired artwork image tab displayed. 

Click on the desired opening on the Unassigned Openings listing.

Click the Add Art Region from Opening button.  

The Art Region will be placed onto the current image tab.

Move the Art Region to the desired position on the current image.

Repeat as necessary with the other unassigned openings.