  We study the energy spectrum of the inclusive bottom-flavored mesons in
top-quark decay into a charged-Higgs-boson and a massless bottom quark at
next-to-leading order (NLO) in the two-Higgs-doublet model. To extract the
result we work in the Zero-Mass Variable-Flavor-Number scheme(ZM-VFNs) using
realistic nonperturbative fragmentation functions obtained through a global fit
to $e^+e^-$ data from CERN LEP1 and SLAC SLC on the Z-boson resonance. We study
both the contribution of the bottom-quark fragmentation and the gluon
fragmentation to produce the bottom-flavored meson (B-Meson). We find that the
contribution of the gluon leads to an appreciable reduction in decay rate at
low values of the B-meson energy. It means the NLO corrections are significant.
