An Event can be a Threat of another Event(s) -- this can be set from IDENTIFY/STRUCTURE > IDENTIFY > Events as Threats.
The Events in the first column are the "Events as Threat", and the Events at the column heading at the top are the Target Event.
To set an Event as a Threat of the Event at the heading, simply check the cells corresponding to the intersection, and then click again to uncheck.
In the example above, the event "Terrorist bomb stock exchange building" is a threat of the Event "Terrorists Smuggle WMD into US and Commit a Violent Act". Similarly, the event "Criminal Network Smuggles Illegal Drugs into the US" is a threat of the Event "Criminal Network Smuggles Counterfeit Goods into the US".
