var Question = "Q2";// replace this with the question code
        var q1Count = 0;
        var answered = 0;
        var error_msg = "Please select an option for each columns";
        var source_question = “Q1”;// replace this with source question code

        /* header */
        $("." + Question +" .matrix-multipoint-question .parent-table thead tr").not('.anchor').each(function(){
                $(this).find("td").each(function(e){
                $(this).addClass("column_"+e);
                });
              });

        /* body */
        $("." + Question +" .matrix-multipoint-question .parent-table tbody tr").not('.error-tr').each(function(){
                $(this).find("td").each(function(e){
                $(this).addClass("column_"+e);
                });
              });

        /* source question */
        var autot = $survey.getSelectedOptionsIndex(source_question);

        for(var i=0; i < autot.length; i++){
                $("." + Question +" .matrix-multipoint-question .parent-table .column_0").addClass("show_column");
                $("." + Question +" .matrix-multipoint-question .parent-table .column_"+autot[i]).addClass("show_column");
               
              }

        $("." + Question +" .matrix-multipoint-question .parent-table thead tr").not('.anchor').each(function(){
                $(this).find("td").not(".show_column").each(function(e){
                $(this).remove();
                });
              });

        $("." + Question +" .matrix-multipoint-question .parent-table tbody tr").not('.error-tr').each(function(){
                $(this).find("td").not(".show_column").each(function(e){
                $(this).remove();
                });
              });

         }
                    

        
        var qCode = "Q1";// question code
        var top_ = 2; // pipe top 2 options
        var update_cv = 1; // update custom variable 1 with piping text
        var piping_txt = [];

        $("." + qCode +" .rank-order-question .answer-options").each(function(){
              var index_ = $(this).find("select.form-select").prop('selectedIndex');
              if(index_ <= top_){
              piping_txt.push($(this).find(".control-label").text());
              }
            });

        $survey.updateCustomVariable(update_cv, piping_txt);


        }