How do you route a requisition for approval based on the department to be charged?

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How do you route a requisition for approval based on the department to be charged?

Example: Department AAA organizes an event for ABC department and cost is charged to ABC department.

The requester is from AAA, however based on the department to be charged i.e. ABC, the Requisition approval routing has to follow ABC department approval chain. 

[This thread is transferred from customer support forum]