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.