You can grade sizes visually, using your mouse.
Note
Before grading, ensure all the required sizes are available. For information about adding sizes, refer to Adding a Size. For information about deleting sizes, refer to Deleting a Size.
To grade sizes visually:
On the Main menu, click Tools, then Sizes and Grading.
In the 2D window, drag each grade point to where you want it to be.
The following image shows visual grading.