This seems like such a simple thing yet i can't seem to figure it out. simply put i have an object that is broken into many different pieces. Using the conectivity and partition nodes i have since grouped these. Now i want to birth a particle from the center of each group, do some stuff in the pop net and then attach that animation back to each group. Any help would be greatly appreciated.

Just worked up a quick example for this. The foreach SOP runs an iteration across all of the groups, based on a group mask, adding a centroid to groups based on color. I should work up a nicer file, showing fracture group centroids, rbd groups, numhit centers etc…