This is a post by Emma Rudeck on the Concurrent Engineering Site.
You have to make a change to your model. It happens. Yet, this can sometimes be a real challenge. Perhaps your design intent is redundant or there isn’t even design intent in the first place. Maybe, your model has been imported from another CAD system and it doesn’t contain any features or the model was created by someone else and now you have to work on it. This doesn’t matter. You still need to make the amendment. You need a flexible design tool.