Hi, not sure if this is by design or not but it has caused me a few problems. I am recreating a Lego set and planned to have one group per bag so anyone using it could easily separate the stages. For easy if I have used a piece in a previous bag I clone it rather than reselect it anew. The only problem with this is that when you clone a brick it also clones the group information, so the new brick is in the same group. Now I can see why you would want this if you have lots of the same brick in the same bag or stage, but there is also a time when you do not want the new brick in the existing group but I cannot find a way to move pieces between groups or remove a piece from a group.