For adding CC or BCC to the notification we use the following technique.
Define a new attribute CC_NAME , of type text or Role which contains the details of the CC.
Use the seeded attribute #WFM_CC and set the default for this to CC_NAME. Also keep Type as Text or “Role” and Source as Send. Drag that from the Item level to the Message level.
In the PL/SQL set the value for this CC_NAME attribute to the people for whom you want the CC to be marked to.
#WFM_BCC can be used for adding BCC.
For adding additional recipients, separated by semicolons (;) as value to this attribute.