Combine two data fields in highcharts - highcharts

Question

My char is like that. I want to combine above On Air Target 2G and Actual 2G as 2G and other two fields On Ait Target 3G and Actual 3G as 3G.
Before combing it display like this.enter image description here
After adding new 2G and 3G It should display like that.enter image description here
When I press 2G tha 2G , On Ait Target 2G and Actual 2G should be hidden. and above function....
$(function () {
var chart = new Highcharts.Chart({
chart: {
renderTo: "barchartloadmunthlydatachart",
type: "column"
},
title: {
style: {
'fontSize': '1em'
},
useHTML: true,
x: -27,
y: 8,
text: '<span class="chart-title"> Grouped categories <span class="chart-subtitle">plugin by </span></span>'
},
plotOptions: {
column: {
stacking: 'normal'
}
},
series: [
{
name: "On Air Target 2G",
data: [1, 3, 5, 5, 6, 7, 14, 15, 18],
stack: 'target'
},
{
name: "Actual 2G",
data: [3, 5, 10, 15, 16, 18, 18, 18, 19],
stack: 'actual'
},
{
name: "On Air Target 3G",
data: [1, 3, 5, 5, 6, 7, 14, 15, 18],
stack: 'target'
},
{
name: "Actual 3G",
data: [3, 5, 10, 15, 16, 18, 18, 18, 19],
stack: 'actual'
}
],
xAxis: {
categories: [{
name: "2016-05",
categories: ["1st wk", "2nd wk", "3dr wk"]
}, {
name: "2016-06",
categories: ["1st wk", "2nd wk", "3rd wk"]
}, {
name: "2016-07",
categories: ["1st wk", "2nd wk", "3rd wk"]
}]
}
});
});

Answer 1

Add the two fake series (with unique ID) for printing symbol in the legend and catch legendItemClick event. Inside the function, define the condition which checks G2 / G3 and call series.update() on particular series.
events: {
legendItemClick: function() {
var chart = this.chart,
series = chart.series,
visible;
if (this.name === '2G') {
visible = series[0].visible;
series[0].update({
visible: !visible
}, false);
series[1].update({
visible: !visible
}, true);
return false;
}
if (this.name === '3G') {
visible = series[2].visible;
series[2].update({
visible: !visible
}, false);
series[3].update({
visible: !visible
}, true);
return false;
}
}
}
Example:
http://jsfiddle.net/o8py1ahc/