MTO scenario with sales order

In an MTO scenario with a PP order which is tied to a Sales ORder is there a way to show the actual costs on the PP order as part of COGS while delivery?

Our scenario is like below:

1) Create a sales order for an FG.

2) Sales Order triggers a planned order.

3) Plnd Order converted to PP Order.

4) MRP run for FG materials.

5) Pur Req raised for the BOM materials.

6) PR converted to PO. (Should PO be acct assigned to Sales Order or PP Order?)

7) Should PP order settled to MAT or Sales ORder?

8) In either case can we move the costs on the PP order as COGS at the time of delivery?

Please advise.

Thanks

Raj