Copy Gradings
Click Kobi Toolkit for Civil 3D tab > Surfaces and Grading panel > Copy Gradings
Select any grading element (3D polyline, ray, surface) to copy grading.
Select the object to which you want to copy the grading (see Create Grading command for more details) or press "Multiple" button to copy grading on multiple objects.
Note that if you press Multiple, grading is created on the whole object (you can't specify grading side and grading region).