Do the conscious, cellular, subconscious, and deep subconscious levels of the mind each have an associated ego or a sub-part serving in that capacity?

We can tell you emphatically that all levels of the mind have an ego function. It will vary in terms of intensity, reach, and power to make its presence felt and to carry the ball if situations compel a person to go into emergency mode, put their armor on and draw their weapon to deal with a confrontation or threat of some kind to the being. That is what the ego is for, to draw a line in the sand and stand firm at times to help a person keep going in the face of adversity and not crumble. So this reflects the wisdom of creation to give every layer of the mind expressing the consciousness of a soul-based being some capability in terms of firepower, to look out for self-interest and not be a ready victim when that can be avoided through a show of strength.