If you no longer need a project category, you should delete it.
When you delete a project category, all of its sub-categories are also
deleted.
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Click Admin in the site navigation bar.
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On the site administration navigation bar, click
CATEGORIES.
The Project Categories tree displays the
hierarchy of existing categories.
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Using the document tree, find the project category that you want to
delete.
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Choose Delete from the
EDIT
menu.
The project category and all of its sub-categories are deleted.