Hi Gopalraju,

I was researching internally and found a similar use-case of drill-down on fusion chart. You could follow below high level design to achieve your requirements.

Try adding the required functionality by utilizing the addEventListener api that fusion charts has ( Events :- http://www.fusioncharts.com/dev/api/fusioncharts/fusioncharts-events.html).  

Add a non-auto generated section. It will get the chart you have rendered on doc load, then add an event listener to the appropriate event with a handler.  That handler can even trigger click on a button and you can refresh a section and have drill down capabilities. 
 
Here is a quick JS snippet to click a button when a data plot is clicked on in the chart:
 
function click_handler(eventObj, dataObj){   
    var temp_bca_num;
    var temp_bca_array;
  
    var temp_bca_num = dataObj.categoryLabel;
   
    temp_bca_array = temp_bca_num.split("-");
    temp_bca_num = temp_bca_array.pop();
   
    var step = dataObj.datasetName;
   
    $("#TempBCANumber").val(temp_bca_num);
    $("#TempStep").val(step);
   
    $(".refresh_graph_btn2 button").click();
   
  }
 
  function getchartdata(){
    for(var key in FusionCharts.items) break;
    var chart = FusionCharts.items[key];
    chart.addEventListener("dataPlotClick", click_handler);
   
  }
 
$(document).ready(function(){
    getchartdata();
  });
 
Kindly notify if it helps.

Regards,

Asif