Spanning morphs across muli groups is easy. Add a magnet to the goup/collar. select the magnet and open the properties tab. Click on Add Element to Deform. Click on the group you want added to the magnet, Chest. Click on the Add Element Deform button again to add the next group to magnet, Abbs, and so on. It only adds one group at a time. Something that would be nice if eF changed so you could pick all the groups you want at one time.

This will let your magnet deform multi groups Very easy..