How close the sales Order

Hi Guru,

Greeting from Sanjeev

My client want to enter the old inquries/Quatation & Sales order in new system. after making the sales order we cannot make delivery as this SO are already invoiced!! we cannot create the Invoice.I want to close this SO. Can we do so in bulk or a ABAP program can be created so that we can provide a screen where the user will enter the Invoice No & the SO will be reflct as closed