Using custom stereotypes

[Ainsley Haslett]

I have a model with many process diagrams in a hierarcichal structure. The process diagrams use the BPMN diagram type.

From a business perspective the processes follow the hierarchy:
mega process
major process
process
sub-process

I was thinking of adding these four labels as custom stereotypes so that when a new process diagram is made it can be flagged as one of these types. In the resulting report the diagram name can be extracted as well as the stereotype name which identifies the relevance of the individual diagram in the context of the entire business process model.

1) Is the stereotype the right place to record this info? (i.e. mega process, major process etc)
2) When I add a custom stereotype I have to select a base class. Which base class should I select for a diagram of BPMN type? Currently I can't figure the correct one to use so specify 'all'.