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I don't know if there's a way to set a determined amount of BB points, but to add or remove is bb points there's no secret, just add the following line on the event:
command = { type = badboy value = -5 }
in this example the bb points of the nation would go down by 5...
I suppose to 'set' an amount you could first subtract 1000 or so and then add what you want to set it to. Not sure if that works in a single event or if you'd need two separate ones.