  In the first paper of this series it was found that the $\eta$-spin 1/2
holons, spin 1/2 spinons, and $c$ pseudoparticles whose occupancy
configurations describe the energy eigenstates of the one-dimensional Hubbard
model emerge from the electron - rotated-electron unitary transformation. In
this second paper we discuss and clarify how the relation of the electrons to
the above objects can be used in a program for evaluation of finite-energy
few-electron spectral functions. As a first step, here we characterize the
dominant holon and spinon microscopic physical processes that originate more
than 99% of the few-electron spectral weight. These dominant processes are
related to exact selection rules for the values of the number of holons and
spinons generated or annihilated by application onto a ground state of
rotated-electron operators. We also generalize the concepts of a lower Hubbard
band and upper Hubbard bands to all values of on-site Coulombian repulsion.
