Inter company Between company codes

Can we do the intercompany process by creating the company code of supplying plant as Vendor and receiving plant company code as customer ? As all the plants which supplies come under one company code and all the plants which receive comes under different codes.Can we treat company codes as vendors and customers ?

To make my point when we send PO to the external vendor it ships the goods from one of their plant and all their plants comes under one Vendor number which we use.

If this is possible please let me know the process.

Thanks