I'm building practice parts. When I change the Global Variables to modify the part, a new dimension which is not Global is sometimes created. The value is the same but it does not have the capital Sigma in front of it. This is causing an error. I can't delete the newly created variable. I can change the value of the newly created variable but it doesn't seem to change anything on the part. Can anyone tell me why this is happening, how I can fix it and how I can avoid this? Thanks.