The NPS Soldiers and Sailors Database shows individual regimental histories and typically lists total casualty figures.
Depending on what you are researching in North Carolina, there is a 3 volume set called Roster of North Carolina Troops in the War Between the States that is free to download or read oline - here is the link to all 3 volumes (
link)
Also, there is a free book online called "Numbers and Losses in the Civil War' by Thomas Livermore (1900) that offers more general numbers for Civil War researchers - it does not go down to regimental level however so would not be helpful in your particular question. More state level and battle casualty numbers.
I believe the Regimental Losses book that Jim is referring to is online
here or you can download it
here
Good luck in your research.