Well, if you're going the group tool route, then rotate the body so that the scapula is visible in the camera. Activate the group tool, and begin to select the polygons which cover that area. As I said, though, it's quite likely that the polygon's will not fit the scapula area exactly, and you're goig to end up with some quite jaggy edge. For something as precise as what you're looking for, I think the control map would be the better method.

jonthecelt