1. Click 
-> Catalogue -> Catalogue.
2. Find the title you want to duplicate a copy against by clicking 
from the toolbar at the bottom of the window.
3. Click the Copy toolbar.
4. Locate the copy that you would like to duplicate.
5. Expand the copy you want to duplicate by clicking the expand icon:
6. Click the 
button.
7. Enter the barcode of the new copy.
8. Click 
.