When you index a collection with support for categories enabled, you must do the following:
<cfindex collection="#Form.IndexColl#" action="update" extensions=".htm, .html, .xls, .txt, .mif, .doc, .pdf" key="#Form.IndexDir#" type="path" urlpath="#Form.urlPrefix#" recurse="Yes" language="English" category="taste, touch, sight, sound, smell">
To use the categoryTree attribute, you specify a hierarchical document tree by listing each category as a string, and separating them using forward slashes (/). The tree structure that you specify in a search is the root of the document tree from which you want the search to begin. The type=path attribute appends directory names to the end of the returned value (as it does when specifying the urlpath attribute).
<cfindex collection="#Form.IndexColl#" action="update" extensions=".htm, .html, .xls, .txt, .mif, .doc, .pdf" key="#Form.IndexDir#" type="path" urlpath="#Form.urlPrefix#" recurse="Yes" language="English" category="taste, touch, sight, sound, smell" categoryTree="human/senses/taste">
For more information on using the cfindex tag to create Verity collections with support for categories, see cfindex in the CFML Reference.