We'd like to have ability to change the mapping of the Audn: Target audience (BKS, COM, REC, SCO, VIS: 008/22; 006/05) to a specific age group facet. For example, many catalog records have a blank assigned for target audience. Search results will include these records but they fall out when the "general" facet is selected. We do not want to manipulate these records to "g" when [blank] is a valid option. Also, we'd like the ability to group the target audience a (preschool), b (primary), and c (pre-adolescent) under j (juvenile) without manipulating the catalog records in our database.