Find and Replace Civil 3D Style Essentials
A video review of the Find and Replace Styles tools in Civil 3D. The video is from the
Autodesk Infrastructure YouTube Channel
Sadly, Civil 3D still does not include a tool to find and replace all Styles of all types with a reference to the default Style name Standard.
Note that both the old and new named Styles must exist in the drawing (perhaps by Reference Template attachments) for Style replacement for all objects of a type to work.