Hi Anubhav,

You can find the escalation field on the incident form.

But only on an Express instance.

Service Management Solutions for SMB | ServiceNow Express

https://community.servicenow.com/   is focussed on Enterprise

Forums - ServiceNow Express Support   is focussed on Express.

There is an article in the Express documentation here about Escalation and how to extend it

Setting up custom escalation values - ServiceNow Express Support

Any questions arising?

Best Regards

Tony