Open Purchase Orders to SNC from ECC

Hi Gurus,

There is one requirement in which I have to take already existing open PO's which are in ECC to SNC.

There are some PO's for which already Partial GR has been done and in some of the PO's deletion indicator is set on some of the line items.

Please suggest what will be the appropriate method to take such already existing open PO's to SNC?

Regards,

Uday