If you have User Profile Services running you can use the Query User Profile action to query for your manager's manager.   Otherwise you can use the Query LDAP action to do the same thing to get that info directly from Active Directory.

Hello,

Do you have any example for Query LDAP?

Thanks.

Hi ,

Were you able to resolve your query.

Use a chain of managers in an approval process 

This is one of the examples of using LDAP query action. Please mark appropriate response as correct to help others in the community.