You can use the context command Save as Pattern to create a new pattern based on an existing class or interface.
Right-click on a class in UML Explorer, UML Navigator, or Diagram views.
Select Save as Pattern. The Create Template Wizard opens:

Enter a name for your pattern.
Select the destination.
Click Finish.
NB: If you choose to overwrite an existing pattern or template, you are prompted with a dialog box to overwrite it.
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