With the help of these tutorials, you can begin modifying grading parameters, making gradings, and altering gradings to balance cut and fill volumes. In Autodesk Civil 3D, a grading has unique qualities and behaviors, just like an alignment or a surface. Like other types of objects in AutoCAD Civil 3D, grading objects have unique attributes and behaviors. The face of a grade is often defined by a base line, a target line, and multiple projection lines. Any open or closed figure might serve as the base line for your projection of the grade.