Alright, well the thing with threesomes is, its never definite. For one reason, not all girls will go for it, so its not something that you can just find a method like a normal pickup. All girls will have sex with you, not all girls will have sex with you and another women. Thats just the way it is, theres really no way around it. You can higher your chances by becoming more attractive, but that will only get you so far. I addressed this a while back in this post....
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Hope it helps.
This second link is my most recent threesome.
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If you have any specific questions feel free to ask, but my best advice is that once you have their attention focused on you, make them almost fight over your attention, but playfully.
That my friend, is as far as I or anyone can probably lead you on the topic. Maybe NLP works, but I'm not a fan of NLP by any means, I think its pretty corny that anyone would resort to a form of hypnosis to get women into bed. But thats just me.
Good Luck