Subcontracting intercompany with a third party

[BD-user]

Hi,

I am currently working on a new subcontracting flow intercompany where:

1. Company A  sells to company B
2. Company A ships materials to third party which finishes the product and ships them to company B

Is there a standard process in SAP for this?

The current process is that we create an SO for the third party from company A and afterwards a PO for company B from the third party. Only this bypasses the intercompany character and i want to have it in one proper flow, instead of it being separated. 

Thanks in advance.