Clustering objects on a diagram groups them by their degree of relatedness. Once clusters are generated, you can move objects in and out of the groups, name the groups, and create new clusters as needed. When you are satisfied that a cluster meets your needs, you can assign an existing tag to its members or generate a tag from the cluster itself, each member of which receives the tag.
To enable clustering click and then click Clustering Options. Check if the appropriate filtering thresholds are met, drivers and utilities are grouped in special clusters named "Drivers" and "Utilities." A third special cluster, "Miscellaneous Components," contains relationship flows with too few objects to cluster.
You generate a clustered diagram the same way you generate any diagram. The only difference is that Diagrammer displays the Large Dataset Returned dialog. Choose Enable Node Clustering in the dialog to draw the diagram with clustering applied. Choose Disable Node Filtering and Clustering in the dialog to draw the diagram without clustering applied.