As soon as a Child is disassociated from the parent, the child no longer contributes to the Bill.
However, Parent-Child relationships do not carry start and end date information. The disassociation of the Child from the Parent will apply to all Bills. Therefore, you need to recalculate all the Bills for the Parent before the Child usage or line items are removed.
No, it will only show up for the new parent. However, you will need to recalculate all the Bills for the previous parent to have the Child usage or line items removed.
Since the Child is disassociated from the Parent, all future Bills no longer have any contributions from the former Child. However, all previous Bills must be recalculated before the Child's usage or line items are removed.
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