Can we create Serial Number and Genealogy using external format without inventory ?

Scenario:

Our requirement is to allow our suppliers to send serial number and genealogy of sub assemblies even before we receive the inventory. We want to create SN and parent child relation without inventory.

We can receive product when it is at the dock and use the already created SN.

Oracle allows to generate SN systematically, but is there a way to create own serial numbers and genealogy ?