Then just select the style that you would like to replace it with in the dialog box.
This will change the style of every Civil 3D object using the previous style.
Just a place to share what I am thinking and tips on getting more productive with CAD Software
Command:_Objectviewer
If you ever wanted trim and extend in the same command, you are able to do so by hold down the shift key to change trim to extend and vic verca.

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