Subgraphs are useful to represent different
levels of a hierarchy in a single diagram and to view each level
separately. As an example, you can have the following levels in a
network diagram: regions, nodes, and equipment.
To create subgraphs:
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Open the network example which you laid out in the previous section by clicking File > Open and selecting the project file
network2.idprif it is not still open.In this example, there is only the node level. To show the use of subgraphs, you can create a regional level. -
Enable subgraphs by clicking Edit > Options in Style Editing Mode and checking Subgraphs.
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Switch to Diagram Editing mode by clicking the middle icon in the vertical toolbar.
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Move the nodes so that Frankfurt is vertically above Paris.
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Drag the mouse around these two nodes and click the Group Selection icon in the toolbar
.
This creates a subgraph containing the group of nodes. On creation, the subgraph is selected and expanded, see the following figure.
An expanded group containing nodes -
Select Singapore.
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Press Shift and click Tokyo to add it to the selection.Do not drag to select this time because that would include the link between these two nodes in the selection.
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Click the Group Selection icon in the toolbar to create a second subgraph.