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bmike: Perfect, thanks again. Al

rclub24: I have repeating sub-components that must be identical as I increase the length of the parent. The idea is to have it totally change only key sub-components as the parent is lengthened without having to interact further with the drawing. Even if I can do this with DC Options it would be one step closer to what we are hoping to do. Scaling doesn't seem like the approach I need. It seems to me that I need to have the parent component copy until I have the length required and have the sub-components change out at pre-determined lengths of the parent component. The sample models for a floor joist system or the fence do exactly what I need except change out key sub-components. When I scale the parent component all the sub-components scale also as you indicated, and the model is no longer correct. We don't want to have to pull components out and in to another SU window as that would defeat the whole purpose of the idea. We just want to indicate that we have a 50 ft. length rather than a 40 ft length and have SU do all the replacing of sub-components without any further interaction. I can make the parent copy to the lengths required. What I am unable to do is have the sub-components change as I do this. By the way, there are more than two sub-components that need to change, but if I can figure out how to do two, I can figure out the others as well. Thanks again for your quick response.