[Solved]-Highcharts: Is it possible to have separate plotOptions for each series?-Highcharts

In addition to the members listed below, any member of the plotOptions for that specific type of plot can be added to a series individually. For example, even though a general lineWidth is specified in plotOptions.series, an individual lineWidth can be specified for each series.

Just pass lineWidth to series as a parameter like:

var series = {
    data: [...],
    lineWidth: 1
};