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Guru Dev 6Guru Dev 6 

How to add users automatically to case related list case team members , when new case is created

SwethaSwetha (Salesforce Developers) 
HI Guru,
You will need to write a trigger to accomplish your requirement.
Below link will give an idea but you will need to write according to your requirement
https://salesforce.stackexchange.com/questions/56392/trigger-on-cases-trying-to-access-predefined-case-teams
 
Hope this helps you. Please mark this answer as best so that others facing the same issue will find this information useful. Thank you