You may want to take a look at the dual-axis chart example. Basically, you just need to make sure that you define your data in separate series, with different y-axes.

var chart = new Highcharts.Chart({
    yAxis: [
        //your yAxis definitions

    series: [{
        name: "Apples",
        yAxis: 0, //the index of the yAxis definition you want to use
        data: [1,2,1]
    }, {
        name: "Oranges",
        data: [10,9,11]
    }, {
        name: "Peaches",
        data: [100,120,150]

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