I currently have a job that will be created using CADduct solids. The architect has provided a 3d model using ADT for our background purposes. When that file is xreffed into our caduct file and 2d plans and sections are created, we need to differentiate between the building and the services. This is done by changing all the layer colours in the architects file to one light grey colour so that, once printed, all the building appears in a thin pen. However, this cannot be done if, as in the ADT file we have been sent, there are blocks that contain different colours to the light grey required. Is there a way that we can change the colour properties contained within these blocked 3d elements without having to explode and remove the intelligence associated with them?