PatternFly supports a flexible navigation approach that can accommodate simple applications with only a few primary items to larger complex applications with up to three levels of primary navigation.

When there are only a small number of primary nav items (less than 5) and no secondary items, a simple horizontal nav is the best choice.

When needed, a context selector can be added.

When there are 5 or more primary items, a vertical menu is recommended.

If there are secondary items, a vertical menu is recommended even if there are only a small number of primary items. In this configuration, you may mix items that require one or two levels. Primary items with two levels may be collapsed.

A third level can be exposed by adding an interior horizontal menu for local navigation. This approach keeps the working level visible at all times. This option is versatile enough to appear in any container.

Note here that a context Selector can be added to the header area at any time to apply context to the global navigation.

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