Creating custom groups to manage your networks and devices, or those of your customers, is a recommended best practice. Custom groups can be based on job function, on sites within an enterprise, or on more granular categories, such as related devices or device interfaces. The Groups feature includes features to let you create multiple structures. You can use individual groups multiple times, in various places in the Groups tree.
A recommended best practice for creating useful groups is to create a "master" group structure that is based on the infrastructure topology of your enterprise. You can then use these groups as references in other custom group structures.
The following example shows a hierarchical group structure for an enterprise network:

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