You can add custom attributes to system objects or change property flags for
attributes.
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Select Administration > Site
Development > System Object Types.
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On the System Object Type List page, click the name of the object
you want to edit.
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On the General tab, click the Attribute
Definitions tab.
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On the Attribute Definitions tab, click the [attribute
name] or the Edit button to edit the
attribute.
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On the Attribute Definition Details page, edit the attributes and
click Apply to save your changes.