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To display list of records

Guys please take a look at this scenario.
I have a custom object named Purchase Order(PO). Once the status in this PO is updated to completed we can't edit it. So, if we need to edit any PO then we need to create another po with in the Original po. For the OriginalPO - pocn__c = 0 and for the newly created po- pocn__c=1. 
There is another object called Expenditure which has a lookup to the PO.
Now, I need to create a link on pocn>0 to display expenditure list of the original po.
Hi Siva,

Could please give a schema of the objects involved would be useful