Accepted answer

Create two series of data - your A and B. Set the A line color the way you want it and then set the B line color in its fashion. Use dashStyle to set the dashes. See here:

series: [{
        name: 'A',
        color: '#0066FF',
        data: [...]
        name: 'B',
        color: '#FF0000',
        dashStyle: 'ShortDash',
        data: [...]

As to how to set up the points to start on the 5th xAxis location. Well, many ways to skin a cat here. But what I did was to pass in null values for the first 4 data points in B. Look at this example.

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