Not quite sure what is the problem, you could private message some examples; however some points Breaking a bond is done by making the copied components unique. for groups, sometimes make unique (right click menu) is available. If groups are the problem then running this script should help http://ruby.sketchup.com/Sketchup/Group.html#make_unique-instance_method [image: 1KMU_Capture.jpg] If the copied groups or components have the same parent, same header then double click the title box to change its name before changing the attributes

@pbacot said: I don't know if this works in your setup or dynamic components for that matter. And I suspect it is no good if you are outputing the chosen material (color) in some bill of materials... But I use "Material Replacer" to globally change a material in a model. Thanks for the hint; I'm sure it is very usefull, but at the moment I suspect to have a serious performancies issue, for which I will post right now in a new topic. Giacomo