Custom process- Insert & update the record at the same time

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Hi All,

I have a requirement as whenever the incident "Assigned" value changes, it should fetch the details from incident object and insert it to the custom object as a new record & update the existing record.

For example-->Incident has been created and assigned to agent "X". At that time, I have fetched the values from incident and update those values to the custom object as a new record 

1. Incident creation time --->10/09/2017 2.53AM
2. Incident update time--->10/09/2017 2.53AM
3. Assigned agent group/name--->Admin/X 
4. ref # --10232
5. Custom object id-1

If the agent "X" assigns the incident to another agent "Y" means, I need to update the existing custom object values of Incident update date alone and also I need to create a new record with the new details as below