Question

I need to provide multiple data points on a single point inside a series. In easy way, on single x axis point, i need to show two y axis points. But when i provide multiple data points, in a series, it show the last on in the graph.

This fiddle has the basic implementation of the scenario. Notice that first series has 4 points and second does have 3. But in graph only 3 are shown.

Answer 1

Check this example I made, it has two series that both have an x value with multiple points.
Example on jsfiddle.

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },

    series: [{
        data: [[6, 540], [7, 540], [7, 1620], [8, 1620]]
    },{
        data: [[6, 340], [7, 340], [7, 620], [8, 620]]
    }]
});

Highcharts will render both values for x=7, connecting them with a line.