score:0

but here also u dont get 2 splines after clicking on fruits, u just get one. is there any way to get that as i have the same issue fiddle https://jsfiddle.net/surya_swami/zx9dy3uj/40/

drilldown: {  series: [{id:"z1",name: "region-1",
                     data: [{ name : "july",y: 10},
                            { name : "aug",y: 21},
                            { name : "sept",y: 15}]
                     },
                     {id:"z1",name: "region-2",
                      data: [{ name : "july",y: 12},
                             { name : "aug",y: 9},
                             { name : "sept",y: 25}]
                     },
                     { id:'z2',name:'region-3',
                       data : [{name:'july',y:23},
                               {name:'aug',y:41},
                               {name:'sept',y:31}]
                     },
                     { id:'z2',name:'region-4',
                       data : [{name:'july',y:33},
                               {name:'aug',y:23},
                               {name:'sept',y:12}]
                     },
                     { id:'z2',name:'region-5',
                       data : [{name:'july',y:31},
                               {name:'aug',y:39},
                               {name:'sept',y:19}]
                     }
                    ]
        }

score:2

the issue is now that you are providing a drilldown.id on the series. you need to do it per point. for example:

 series: [{
            name: 'things',
            colorbypoint: true,
            data: [{
                name: 'animals',
                y: 5,
                drilldown: 'animals'
            }, {
                name: 'fruits',
                y: 2,
                drilldown: 'fruits'
            }, {
                name: 'cars',
                y: 4,
                drilldown: 'cars'
            }]
        }],

it looks to me like you want to have any drilldown on a point in "fruits" to link to the same drilldown series. this is doable:

series: [{
    name: 'fruits',
    data: [{
        x: date.utc(2014, 7, 19),
        y: 12,
        drilldown: 'fruits'
    }, {
        x: date.utc(2014, 8, 19),
        y: 5,
        drilldown: 'fruits'
    }, {
        x: date.utc(2014, 9, 19),
        y: 18,
        drilldown: 'fruits'
    }]
},

see update fiddle.


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