How to Escalate an Incident to Support II in ServiceDesk 7.5 SP1

Hi guru's,

Iam new to Servicedesk and want to escalate an incident to Support group level II. can any one help me to understand how to do this in Servicedesk 7.5 sp1.

I already created a service queue where incedent are assigned to Support group but When SLA exceds for support Group or User or priority is high then how to Auto escalate the incident to next level support .

Regards

Vicky