Joomla! Documentation™

No, Articles and other content items cannot be assigned to multiple categories or sections. In Joomla! 1.0 and 1.5, content items are restricted to a single category in a single section. In Joomla! 1.6 you are restricted to a single category in a category tree.

Possible work-arounds include:

• creating duplicate articles in multiple categories.
• using menus rather than dynamic lists of content items.
• using various third party extensions that simulate assignment to multiple categories.
• using key words to simulate categories and sections.