在</file>和</modification>标签之间添加:

 <file name="###File name with path of controller/ model file ###" >
      <operation info="###Operation Info###" >
 <search position="###Search/Replace filter###" regex="false" ><![CDATA[###Search Code###]]></search>
 <add><![CDATA[
  ###Add Code###
  ]]></add>
      </operation>
 </file>

参考链接:Opencart Vqmod教程