Hi @Cadguru42,
The only out-of-the-box nodes that are currently available for working with styles are CivilObject.Style and CivilObject.SetStyle. There may be a 3rd-party package available to do more with style management, but I can’t say for sure. For anything related to the Civil 3D Toolkit, I’d recommend posting in Civil 3D Toolkit Feedback thread to see if the authors can help.