Requests can be cancelled for each individual supplier that participates in the sourcing event, while being left open for other suppliers to continue negotiations. To cancel a request:
When a sourcing event is cancelled for a supplier, that supplier will receive an automated email to notify them that the negotiation process has been discontinued.
Entire requests can also be cancelled for all suppliers by following the same steps 1 & 2 above but then you'll see a "Cancel request" button to cancel the request.