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When you acquire all products under a dossier, the dossier and related sequences transfer to you.
If you acquire only some products, new e-Identifiers (e-ID) will be assigned for those. This is called a partial transfer.
To find out how to request an e-ID, read Submit data in electronic Common Technical Document (eCTD) format.
Start the first sequence of your new application with the next sequence number from the old e-ID. This shows evaluators that the medicine was initially reviewed under a different identifier.
Include the old e-ID in the cover letter of your new eCTD application.