Hi @NishaB,
Simply put (and as others have stated), the Incident management module does not have a workflow associated.
The process is managed principally via Business Rules supported by UI Policies, Client Scripts and Assignment rules.
A good place to start and get an overview is to view the Business rules against the Incident table using a query similar to below. (Please note - this is based on OOB - Out Of Box Business Rules, it is highly possible you'll have more configured on your instance.)
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Thanks, Robbie
