How to add the project cost into a PO

Hi SAP guru,

Here is my problem

My user wanted to reflect the shipping cost into the PO when a PO is being raised.

The vendor for the PO item and the vendor for shipping are different vendor.

Query #1.

How can i built the PO cost and shipping cost into the same PO when there is only 1 vendor to enter in ME21N?

Secondly, the shipping cost need to be added to the MAP price of the  item when a GR process is being done.

User wanted to see the additional cost reflected on the SD order during creation. This allow to better reflect the margin in the SD sales.

Lastly, the shipping cost is only a estimated cost  and still pending a physical invoice fron the vendor.

When the invoice came, how does the system offset the earlier entry?

Is all this possible to be configired ?

Thanks

Bye