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         From the Referential section of the action bar, click Create Routing Network
           .From 3DSpace or 3DSearch, drag the appropriate file onto the "drop source data here" zone displayed on the referential. 
        In the Dataset Name box, enter the name of the routing
          dataset.
      
        Click OK. 
        A pop-up message informs you when the creation is successful and the
            City Referential panel opens (this is the case whenever a dataset
          is created).
        To delete a routing dataset, right-click it in the Available Routing datasets area, and
          then select Delete Dataset.
      
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