Working With Model Items and Diagrams > Working with diagrams > Editing diagrams > Copying items on a diagram
  
Copying items on a diagram
1. Select the items you want to copy.
2. Press and hold down the Ctrl key, and then drag the items to the required position.
You can copy child items to other parent items on a diagram, such as Attributes and Operations of a Class.
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If you add the Utilities profile to a model, you can save a diagram to a file.