Allocation rule for child values of different Parents

Summary:

We would like to create allocations to several child departments that currently exist under their own parent. Example: Parent 400 - Child 4001,4002 and other parent 500 with child 5001,5002.

The system currently doesn't allow to have those child departments under two different parents and we need this structure for specific rent allocation. The original structure of department hierarchy is needed as well. Do we must revoke the

values from their original parent and create unique hierarchy just for this allocation ?

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