[Solved]-Highcharts: How do I set dynamic data to the drilldown pie chart?-Highcharts

You can access drilldown at runtime using chart.options.drilldown

var newDrillDowns = {
                id: 'my drilldowns',
                data: [
                    ['Cat1', 4],
                    ['Cat2', 2],
                    ['Cat3', 1]
                ]};

chart.options.drilldown.series[0] = newDrillDowns;

In the same way you can replace drilldowns completely

chart.options.drilldown.series = [newDrillDowns];