You can create a stereotype within a metaclass, a criterion, or another stereotype.
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Right-click a metaclass, criterion, or stereotype, and select in the contextual menu.
A new stereotype is created with a default name.
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Type a stereotype name in the Name box, and fill in any of the other properties that are relevant.
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Once you have created the stereotype, you can define extensions like a custom tool, or custom checks for the stereotype. These extensions will apply to all metaclass instances that carry the stereotype.