Same Vendor, Different VANs

[PettittM]

We are implementing EDI at a new factory (new plant code) and the new factory is using a different VAN with no desire to transfer to our VAN. For 850 PO, in some cases we will be using the same vendors. How can we segregate our PO's for this vendor from another plant code's PO's when they need to go to separate VANs? Is there some standard best practice to do this? Thank you!