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I have a Highcharts chart that works great and has custom formatting for the yAxis labels using the following formatting.

yAxis: {
 labels: 
 formatter: function () 
 var newNumber = formatNumber(this.value, 1);
 return newNumber;
 
;

However, when I dynamically add a series like below, the yAxis labels do not have the same custom formatting. It looks like they just end up using the default Highcharts number formatting.

chart.addSeries(
 data: newData,
 yAxis: newDataName
);

How can I make it so the dynamically added series has the same label number formatting as the originally loaded series?

Also, note that I need to name the dynamically added series ("newDataName") so that I can reference it again later to remove it.

And here is how the axis is added dynamically as well. Because to clarify, I am adding a series, but also adding an axis to display that series.

chart.addAxis(
 id: theData,
 title: 
 text: "newAxis"
 
);

Since you are dynamically adding both a series and a new axis that the series should be using, this axis also needs to include the formatter details. For example (JSFiddle):

// New axis
chart.addAxis(
 id: 'new',
 // Which also has the label formatter
 labels: 
 formatter: function () 
 return formatNumber(this.value, 1);
 
 ,
 title: 
 text: "newAxis"
 
);

// New series which uses the axis
chart.addSeries(
 data: [43934, 52503, 57177, 69658, 97031, 119931, 137133, 154175],
 yAxis: 'new'
);