I'm new on Creo 4.0 and I have an issue: I was working on an assembly and unfortunately I have deleted my Workpiece part from my computer. It's the only part that have been deleted but all the other features were created by reference to this one. I tried to create a new one and then edit the references of my features but it's very long and even worse sometimes it doesn't work. I also tried to retrieve the missing Workpiece with the new one but it doesn't work neither. Am I force to start all over again or are there any solutions?