Reprocess orders

we have reprocess order type as ZP12,

When a reprocess orde to be done, what we do we create a order

original order 13899034

Reprocess order as 13899034QAA

based on the reprocess type. But the issue the original order has the sales order link. But the reprocess orders the sales order number will go to the Long text field. It not get captured to the sales order cost. How can we do this. How can I link the sales order to the reprocess order. Please advice.