I've always disabled configurations for newly inserted Toolbox parts, so that new parts are copies of the master part with changed dimensions. I've also never used "edit toolbox definition", but tried it today. I expected Toolbox to create a new copied part with the desired dimensions, but no, it wants to create a *configuration* of the master part. This completely defeats the decision to skip configurations in the first place! This may be old news to many of you, but it just became my pet peeve of the day. Art W