For the complete tutorial, (and many others) follow this link...
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Better Elevation Banding In Civil 3D
Purging Styles from Civil 3D Drawings
Labeling Pipe Network Structures from the Top or Bottom in Civil 3D
Tips to Improve Civil 3D Performance
Improve Civil 3D Performance by Optimizing Label Styles
Improve Performance of Large Surfaces with a Data Clip Boundary
Rotating Civil 3D Point Symbols Independent of Label Text