Delete an Advanced Control
You can delete advanced controls, although only one at a time.
The control must be at the Inactive status. If you delete an incident control, you also delete all incidents the control has generated. If you delete a data set control, you also delete its results and the user-defined object based on it.
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            Edit the control you want to delete to set its status to Inactive. 
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            Navigate to the Controls page. In it, select the row for the control you want to delete. 
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            Select the Delete option from the Actions menu.