I had created a PO with 2 line items against a particular PR. PR was for 5 lakh units. The two line items I had created was for 1 lakh and 50,000 unit respectively. The PO is already been released from all the levels. Now I want to use the rest units of PR (i.e. 2.5 lakh units) to make another line item uder the same PO number (most preferable) or fresh PO. How can I do it?