You can either select Enable Category Support from the ColdFusion Administrator, or write a cfcollection tag that uses the category attribute. By enabling category support, you create a collection that contains a Verity Parametric Index (PI).

<cfcollection 
    action = "action"
    collection = "collectionName"
    path = "path_to_verity_collection"
    language = "English"
    categories = "yes">

For more information on using the cfcollection tag to create Verity collections with support for categories, see cfcollection in the CFML Reference.