In order to delete a particular selected point, you first need to set allowPointSelect
property to true, and then, on point click event pass the reference of this point to the chart object, so that when clicking delete button, you can remove it.
https://api.highcharts.com/gantt/plotOp ... ointSelect
https://api.highcharts.com/gantt/plotOp ... ents.click
https://api.highcharts.com/class-refere ... int#remove
In this forum as well as among all support channels, we pursue to provide answers to all kind of questions regarding Highcharts products, but we aren't able to suplly custom solutions, like with Salesforce database update.
In case of any other questions related to Highcharts, feel free to ask anytime.