Duplicating Shape Keys (Sources)
To duplicate a shape key
• Select the shape key in the explorer (in the model’s Mixer > Sources > Shapes folder) and do one of the following:
- Press Ctrl+D (or D).
or
- Choose Edit > Duplicate Single from the Edit panel.

You can then rename the duplicated shape keys with more descriptive names as soon as you create them so that you can identify them later in the mixer. You can rename a shape key as anything else in the explorer (for example, click the shape key name, press F2, and enter a new name).
All shape clips in the mixer referencing that source are updated with the new name.
Autodesk Softimage v.7.5