Thanks for the input Dharmakasi..
But i need to hide categorization codes from Categorization schema assigned to Service Confirmation transaction.
i.e. In Service Confirmation, Assignment block Categorization is there to display Categorization schema assigned to the Service Confirmation. Within that Schema, we have Catalog, Code group, Codes.
So based on Service Confirmation process type, i have to hide some of the codes present within the Categorization schema.. i.e. Some codes are restricted for particular Service Confirmation type.