Unable to access / create a Process plan assembly.

Apologies for the silly question, but is the Process plan (Pro-Process) an add on module to be purchased separately with the application? I attempt to access via File-> New-> assembly (Type)-> Process plan (Sub-type). Nothing happens. I notice there's also Process plan (Sub type) in the Manufacturing (Type menu). Neither options are 'ghosted out' and I'm not getting a prompt stating the module is not available.Is there a configuration setting that needs to be activated?

Thanks in advance.

Bob