Accepted answer

A very simple example:
First you have to create your new yAxis and set it's position.

    title: {
        text: 'Other data panel'
    top: 300,
    height: 100,
    offset: 0,
    lineWidth: 2,
    opposite: true

Then, when you create your serie you in what yAxis it will be placed.

    type: 'column',
    name: 'Other',
    data: otherData,
    yAxis: 2,
    dataGrouping: {
        units: groupingUnits

You can see it working here.

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