The Global Catalogue will allow you to select from different "merge by" options. These options will allow you do things like add a copy to an existing record or create a duplicate record.
1. Click 
-> Catalogue -> Global Catalogue.
2. From the Tool bar located at the bottom of your screen. Look for the Manage Duplicates by: drop down.
3. Append copy will always be the default selection. But if you wish to change it simply click on the 
icon and select from the following:
| Append Copy | Adds a new copy if the record already exists in the catalogue. |
| Replace Record | Completely replaces and existing record if it exists. |
| Duplicate Record | Creates a Duplicate Title record and adds a copy to it. |
| Replace on Order | Replaces any records as On Order and sets it to available. |
4. Once you have selected the "merge by" option, You can continue the import process.
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