You cannot use DSCC to perform this task. Use the command line, as described in this procedure.
Identify the primary and secondary data views that will be aggregated to form the join view.
The primary and secondary data views must exist before the join view can be created. The primary and secondary views can be any type of data view, including an LDAP data view, LDIF data view, JDBC data view, or another join data view. Specific properties must be configured on the secondary view to allow it to function as the source for a join view. For more information, see To Configure the Secondary View of a Join View.
Create the join data view.
$ dpconf create-join-data-view -h host -p port view-name primary-view secondary-view \ suffix-dn
(Optional) View the list of join views to check that your data view has been created successfully.
$ dpconf list-join-data-views -h host -p port