categories in categories with hierarchical structure

[Migrated From Jforum.net]

I want to create category in category.
example;
First category :Software
Second :Collabration tools under the software category--- moderator A
3.category:e-mail under the collabration tolls ---moderator B
4.category:Automation documents under the collabration tools--moderator C
.....etc

is it possible this structrure? How?
can you help ,please?
[originally posted on jforum.net by erdem_ustun]

[Migrated From Jforum.net]

This is not available in the underlying DB structure. I know it was talked about for V3 but not sure if it got rolled in or not.

However, I think some people have "faked this" by using a standardized category naming convention and modifying the main forum listing template to indent categories. E.g., use the names like 1.0.0 Somecat, 1.1.0 Sub, 1, 1.1.1 Sub Sub 1... Then use Freemarker scripts in the template files to parse out the category prefix and use this to create HTML that indents the display accordingly.

This will display a psuedo-hierarchy at the main level. However, managing and displaying sublevels will still be done like individual categories.
[originally posted on jforum.net by monroe]