score:1

Accepted answer

You can use two xAxis with categories. For example:

xAxis: [{
  opposite: true,
  lineWidth: 0,
  categories: ['Start', 'Category1', 'Category2', 'Category3', 'Category4', 'Balance']
}, {
  linkedTo: 0,
  lineWidth: 0,
  categories: ['', 'Sub-Category 1', 'Liquid 1<br>Liquid 2', 'Gas 1<br>Gas 2', 'Solid 1', ''],
  labels: {
    rotation: 0,
    y: -10
  }
}]

Live demo: https://jsfiddle.net/BlackLabel/a9bzeqw4/1/

API Reference: https://api.highcharts.com/highcharts/xAxis.labels


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