In standard SRM/EBP there is no functionality via configuration to automatically create different PO numbers. Having said that, you can create new document types and utilize a couple of BADIs to activate the document types based on a trigger in the shopping cart. For each document type you have the ability to create a new PO number range. Define this number range in EBP and in SAP R/3.
You'll need to utilize BADIs: CHANGE SHOPPING CART and PO CREATE BADI
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