How to create PO from one palnt to another plant

Question

Dear All,
We need to create new Purchase orders from One plant to another plant. Can you please provide me any suggestions to achive this.
Main hurdle are: We need to create new PO for the completely open Purchase order for old plant.
Secondly we need to create PO from old PO which have partial goods receipt and which have equally invoice receipts, so that we can create new PO for the open quanityt and the open invoices.
I do not see any other case which we can consider to open new PO from the old PO. If there are to consider some please do let me know.
Secondly we have to extend the materials from one plant to another plant. Issue is we do not know which views are maiantained for materials which needs to be extend also what are the fields filled for each views. In order to avoid extracting the data from table, structuring it and then reload for new plant we are planning to create some program or is there any existing standard program which can extend material from one plant to another.
One more issue in out plant extension is we have some Z fields in MARC so how we can use that too to extend it to another plant.
Can you please provide me some suggestions/help on this.
Thanks.
Shashi

Answer 1

Please check this answered link for extending material to another plant through BAPI:
BAPI to extend material
If new fields are added to material master, they are applicable at client level, so after extension to new plant, those newly created fields will be available there as well.
For copying PO's to new plant, you can copy them through ME21n.