Third Party Sales with Intercompany Scenario

Hi Experts,

I need your help in this.

I have a Third Party Business Scenario in which One Plant A will raise PO to a Plant B ( in SAP ) and the Plant B as a Vendor delivers the goods

directly to Plant A storage location followed by MIRO.

Note: Plant A and Plant B belong to different company codes.

Plant A with the stock will deliver the goods to the customer followed by Customer Invoice.

Normally in Third Party Scenarios, Vendor is external to SAP and we won't consider the stock.

Now the issue is that we want the Plant B stock to be reduced in the system in this scenario.

Let me know if you have questions.

Please Guide me..