Thanks John!

function doStuff() {
   var sysparm_table = "";
   var sysparm_sys_id = g_form.getValue('u_number');  
   var sysparm_query = "parent=" + sysparm_sys_id;

   //Define the related list table
   sysparm_table = 'my_related_table';
   runContextAction(sysparm_table, sysparm_query);
}

function runContextAction(sysparm_table, sysparm_query) {
  //Obtains the rows number of the current report
  var sysparm_rows1 =$$('.list_row_number_input span')[1].innerHTML;

  //Parses string value into an integer value
  var num_rows = parseInt(sysparm_rows1);

  //Get view name needed to export
  var sysparm_view =gel('sysparm_view').value;

  //Creates export file if rows is less than limit value
  if (num_rows < g_export_warn_threshold) {
     var dialog = new GwtPollDialog(sysparm_table, sysparm_query, sysparm_rows1, sysparm_view, "unload_excel");
     dialog.execute();
     return;
  }
  var dialog = new GwtExportScheduleDialog(gel("sysparm_table").value, sysparm_query, sysparm_rows1, sysparm_view, "unload_excel");
  dialog.execute();
  return;
}

Other than that, this is very useful functionality.

While it’s true that you can right-click a breadcrumb and open it in a new window, this method is nice because it’s more consistent and intuitive for all users of the system.