If the event behind this is that customer A has been bought by customer B, I guess you should create a special flow on your infoprovider by reprocessing all the records, transforming A into B.
Another option could be to add a nav. attribute to your customer object, let us call it "reporting customer", and put B into this value for customers A and B, C in C ....
In the query designer you can do that with a structure, but this implies to maintain this structure by hand, and it's not very usefull if you have plenty of customers.
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