Sometimes we have N/A category with no information related or unnecessary  visualization.

Here is a quick way to remove N/A category with data attached:

here is such an example:

when we drill down by region we will get N/A column which we don't care about.

1. copy and paste the following script in the widget script

widget.on('render', function(se, ev){

    var removeCategory = 'N\\A';

    var categories = se.queryResult.xAxis.categories; // get the categories
    var series = se.queryResult.series;    // get the series

    var catIndex = categories.indexOf(removeCategory); // find N/A category
    
    if(catIndex != -1){ // if N/A category found
        categories.splice(catIndex, 1);    // remove it from category list
        // remove data at the same index    
        _.each(series, function(ser){
            ser.data.splice(catIndex, 1);
        })        
    }
})

this script can be used to remove any other category by changing the string 'removeCategory'.

result: