How to have different operation working hour for the same site

How to have different operation working hour for the same site

Hello Support team, 
I don't know how to configure this requirement 

Conditions:
- Have site A-Regional
- Have IT support Group works 09am-18pm, Mon-Fri only. Seres all  requester on A-Regional
- Have Urgent Support team works 24/7 around the clock. Serves all requester on A-Regional

Question:
- How to configure operation hour for each of them on Servicedesk Plus?


Regards
Eric

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