Auto delete incident task when selected affected location is de-selected onrelated list of incident

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Hi, I have a requirement whereend user select the affected location(cmn_location), incident task will be generated automatically through BR under the related list of incident. once incident task is closed complete, tax expense line(fm_expense_line) will be genaretd.Now, when user de-select the same affected location, it should delete already generated incident task also expense line so that sum of expense line will be calculated correctly.

BR: async ( insert - true)

table : affacted location

condition : task type is incident

(function executeRule(current, previous /*null when async*/ ) {

    // Add your code here

    var incTask = new GlideRecord('incident_task');

    incTask.initialize();

    incTask.location = current.location.getValue();

    incTask.incident = current.task.getValue();

    incTask.short_description = 'Add Downtime to- ' + current.location.getDisplayValue();

    incTask.assignment_group = current.task.assignment_group.getValue();

    incTask.assigned_to = current.task.assigned_to.getValue();

    incTask.cmdb_ci = current.task.cmdb_ci.getValue();

    incTask.insert();

})(current, previous);

Any help on this really appreciated.

Thanks,

Abhishek