Is there a way to save custom sculpt brushes and saving custom icon to keep them in my Blender Library??
Click the “F” on your brushes and save your startup file. I ‘m not sure how you do the custom icon ,but I know it’s possible. Looking at this thread https://blenderartists.org/forum/showthread.php?409326-Zbrush-Orb-Brush-pack-for-Blender-3D. might help answer your questions to. These brushes have custom icons.