Project Categories 
You may also specify as many categories as you wish for a project. These apply to all issues in the project, regardless of issue type. Categories simply create an additional organizational unit. They are especially useful if you have people with specific areas of expertise. If you do not create any categories for a project, users will not have the option of specifying a category, although Unknown will still be shown when viewing an issue.

When you click the category link, you will be shown a list of categories for the project:

When adding or editing a category you will see the following options:

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