I have tried to copy a file of a part and then try to edit it in an assembly but the software seems to change all the copies even though it has a different file name. I tried to save the part I want to copy to an new part name. Then edit the part then replace the parts with the old part. This is a big pain too. I then create a new part in an assembly and then save as the new part name then build up the part. Its ok for simple parts . Does someone have a better copy part to a new name method?