Hi Mike,
I am working on similar project. We hired a vendor to migrate QB data from prior years into an Acumatica tenant. Our production tenant has AR and AP transactions, Purchase Orders, inventory and sales order/invoices. We can’t use snapshots because we lose production transactions which are not in the migrated tenant. It gets a little complicated. The vendor has developed a tool to have one tenant update the others. The ultimate result is new production with migrated data, and all our current year transaction updated. It is one shot. I don’t want to do this again. :).
I am not sure what your project needs but I could connect you with them.
Evan