In v6.1, Settings--Companies--Header/Footer, how to assign different footer for Quotation/SO/PO.
<drawCentredString x="10.5cm" y="1.7cm">[[ report type = Quotation ]] footer1</drawCentredString>
<drawCentredString x="10.5cm" y="1.7cm">[[ report type = SO ]] footer2</drawCentredString>
<drawCentredString x="10.5cm" y="1.7cm">[[ report type = PO ]] footer1</drawCentredString>