Vacation rule for supervisor , how to route self item approvals to other person

We have a sceneraio where supervisor has a vacation rule set and all the approvals for the supervisor gets routed to the employee authorized and that is o.k. But we want when the employee creates his/her requisition or expense report it should not go to the supervisor but to some other person as if it goes to the supervisor it will come back to him as the supervisor has a vacation rule.

Is there a way we can do this. Appreciate your reply