如何隐藏高图中的分组类别

Question

大家好，非常感谢您的支持，我有以下代码的高图，一切正常，但有两个类别，我只想显示一个，但我想将其数据保存在工具提示中，所以有什么方法可以隐藏第一类，并显示其中之一。我还在代码中评论了我想要的内容。任何帮助将不胜感激。感谢

$(function () {
var chart = new Highcharts.Chart({
    chart: {
        renderTo: "container",
        type: "line",
        borderWidth: 5,
        borderColor: '#e8eaeb',
        borderRadius: 0,
        backgroundColor: '#f7f7f7'
    },
    title: {
        style: {
            'fontSize': '1em'
        },
        useHTML: true,
        x: -27,
        y: 8,
        text: '<span class="chart-title"> Grouped categories <span class="chart-href"> <a href="http://www.blacklabel.pl/highcharts" target="_blank"> Black Label </a> </span> <span class="chart-subtitle">plugin by </span></span>'
    },
    series: [{
            name:"Low",
        data: [4, 14, 18, 5, 6, 5, 14, 15, 18]
    }],
    xAxis: {        
        categories: [{
            name: "20",//should not hide this
            categories: ["21", "22", "23","24"],
            // I want to do hide this categories:["21", "22", "23","24"]
        }, {
            name: "25", //should not hide this
            categories: ["26", "27", "28","29"]
            // I want to do hide this categories:["26", "27", "28","29"]
        }, {
            name: "30",// //should not hide this
            categories: ["31", "32", "33","34"]
            // I want to do hide this categories:["31", "32", "33","34"]
        }]
    }
});

}）;