You design a MultiParty Collaboration using a process with a <<MultiPartyCollaboration>> stereotype.
The MultiParty Collaboration process is a composite process with a sub-diagram describing the synthesis of Binary Collaborations and Business Partner Roles:
This sub-diagram uses organization units to design the Business Partner Roles and role associations to design the Performs link between organization units and processes. The processes used in this MultiParty Collaboration diagram are Binary Collaboration processes. We use shortcuts of processes to reuse Binary Collaborations defined under another package or model.