Grading Group Creation in Civil 3D

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What is Grading Groups function in Civil 3D? Can someone point me in the right direction to understand it's proper use?

Thanks in advance for your help.

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Emile Zankoul On

Grading groups are used to organize gradings into named collections for surface creation and volume computations.

You can choose whether to automatically create a surface from the grading group, and you can identify a base surface for volume calculations. Once you create a surface from a grading group, you can use the Grading Volume Tools to adjust the elevation of the grading group to balance cut and fill volumes.

https://knowledge.autodesk.com/support/civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2021/ENU/Civil3D-UserGuide/files/GUID-E36190B3-533B-45A6-8409-8B8C44BDD0C0-htm.html