How to make articles appear in both of section and category

[downloadvyp]

How do I make articles appear in sections and categories in Joomla? When I add an article I select the section and the category ,but the article will appear only in the category not in the section as well. If I select only the section, the article will not appear in the category. How do I make it appear both?

Thanks for your help!

[Bernd]

Joomla: Organizing Your Content | Content Management | How-Tos (http://www.howtojoomla.net/200609139/how-tos/content-management/organizing-your-content)