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To add properties to a metaclass, CUSTOMMETAPROPERTIES are required. To access the CUSTOMMETAPROPERTY, switch to the Content view in the ClassBrowser. Then, drag Custom -> Main -> Base -> CUSTOMMETAPROPERTY into the BulkEditor. When creating a new property, first specify the name and description. Next, define the namespace and the data type.
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To add the newly created properties to a metaclass, drag the corresponding metaclass into the ClassDetails Editor. Then, drag the desired properties from CUSTOMMETAPROPERTY into the metaclass.