What about doing a rollup suite?
Select A and B to be added to new rollup suite.
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Data can be copied over from one report suite to another through Engineering Services engagement. However this is not a free service, and if you would like to scope it, reach out to your Account Manager.
I know the concept of Roll-up but I'm in need of copying data from one RSID present in Company A (or Marketing Cloud) to another Marketing Cloud
All these Clouds are have a parent Marketing Cloud ie
Parent Marketing Cloud --> Company A ( Child Marketing Cloud)
--> Company B (Child Marketing Cloud)