your question is just a little vague. If you want a nurbs 'square' to be grab-able as a single object, there are a couple of ways to deal with that. As for getting a situation where several nodes affect each other like that (where grabbing one object grabs and moves all of them), I don't think there is (although there could be, I just kinda doubt it). It almost easier to parent them to something that you can grab to move all of them, things like that, usually.
Anyway, if you put up more detailed information, we might be able to help you more.