AssetDatabase.CreateFolder

public static string CreateFolder (string parentFolder, string newFolderName);

파라미터

parentFolder	The name of the parent folder.
newFolderName	The name of the new folder.

string The GUID of the newly created folder.

Create a new folder.

string guid = AssetDatabase.CreateFolder("Assets", "My Folder");
string newFolderPath = AssetDatabase.GUIDToAssetPath(guid);