[Solved]-Add data dynamically to the top level in highcharts when drilling up-Highcharts

You can use the drill up event for the same and assign the value for the necessary levels,

events: {
    drillup: function(e) {
      this.options.series[0].data[0] = {
        name: 'Databases',
        y: 20,
        drilldown: 'dbs'
      }
    }
  }

In case of adding a new datapoint you should call this.series[0].setData()

this.series[1].setData([{
            name: 'Dieren',
            y: 5,
            drilldown: 'animals'
          }, {
            name: 'Fruit',
            y: 2,
            drilldown: 'fruits'
          }, {
            name: "Auto's",
            y: 4
          }, {
            name: "test's",
            y: 4
          }], false, false);

DEMO

DEMO USING CUSTOM Button