Approaching groups of girls is easy, you just walk up to them and say something passably interesting. I wouldn’t exactly ignore the girl you’re interested in, but I wouldn’t beeline for her either. It’s going to be way easier to make conversation at first with the friends that you don’t have sexual tension with, and if you can win them over, they’ll start to see what’s going on and work to help you two hook up.
If they don’t like you then they will try to obstruct you, this can work in your favor too, but it’s way more pick-uppy to try to push through an agenda if you have her friends working against you. But it can be really fun on both sides to get with a woman that way.
Passably interesting means anything that isn’t “hey how are you guys doing?” or something equally contentless. People will often suggest that you just walk up and say, “hi, my name is…” but what they always forget is that conversations require conceits to carry them and that approach has no conceit, requiring you to come up with one.
A conceit is simply a ‘stated’ reason why the conversation is taking place. Something as simple as what kind of music is playing. You yak about that until someone finds something else to talk about and you all move on to that. A good, functioning group conversation will bounce around all different kinds of concepts while everyone in the group gets to know each other on a subconscious level.