How to migrate training of Document IO AP invoices from lower instance to Prod

Summary:

We are having a new entity coming in Fusion and for that we are enabling Payable agent/Document IO, so how can we do the training in lower instance for that entity's invoices and migrate to Prod? Do we need to do as per invoices for top suppliers or for all supplier invoices? and how to migrate to Prod. I know there will be a discrepancy of supplier id between two instances so how to handle that? Do we have any import/export functionality by which we can directly transfer the training to Prod?

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