References
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Using this option, you are able to determine whether a level is displayed through a part reference. See Assemblies for more information on part references. When the Reference Display setting is checked, a checkmark will appear in the Reference Display cell of the Levels List window. When unchecked, the Reference Display cell for that level will be blank.
Using the Function:
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Select Reference from the View>Level>Display submenu.
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Choose the level set or OK if none exists.
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Enter the level number(s) to reference display, or select an entity.