So I'm finally were able to upgrade the Solidworks from 2018 to 2019. Then I noticed the relationship between the sketch and the plane disappear. I'm not sure if I even knew how to ask the question which is part of the problem. So when we created a sketch from Plane, there used to be an arrow that point the new sketch I just created to the plane where it's created from. What's that called and how do I turn it back on? Hope the question makes sense. Many thanks in advance for all of your help again.