You can view and mark up CAD documents using the CAD Document Viewer in the Unity Client. In addition, standard OnBase functionality, such as use of cross-references, is available from the Document tab. For more information on using cross-references within OnBase, see the Unity Client documentation.
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Depending on your system's configuration, you may also be able to open a CAD document from OnBase in an external application such as AutoDesk TrueView. This can be accomplished by configuring a custom file format in the OnBase Configuration module. See the System Administration documentation for more information on configuring custom file formats.