Hi,
Hope you are looking for intercompany stock transfer, in the same client under the same flagship of 1 group company one line of business is selling material to other line of business that is the meaning of cross company sales
Go through
http://help.sap.com/saphelp_46c/helpdata/en/dd/5614f4545a11d1a7020000e829fd11/content.htm
Check for intra company STO
https://scn.sap.com/message/7843622
Regards,
Amala