  H.~Yamamoto has proposed employing $B$ mesons produced in conjunction with a
single charged pion at an $\Upsilon$ resonance for studies of CP violation in
the neutral $B$ meson system at a symmetric $e^+$-$e^-$ collider. The sign of
the charged pion would tag the neutral $B$ meson. We estimate this branching
ratio, employing the heavy meson chiral effective field theory. We find a
negligible branching ratio to $B B^{\pm} \pi^{\mp}$ at the $\Upsilon$(5S) and a
branching ratio of only a few percent at the $\Upsilon$(6S). However, if
nonresonant studies of neutral $B$ mesons should prove feasible, Yamamoto's
proposal could be a good method for tagging neutral $B$'s for the study of CP
violation at a symmetric collider.
  We also explore the possibility of studying $B_s$ at the $\Upsilon$(5S). The
rate is low but depends sensitively on the precise value of the mass of the
$B_s$. The background we compute is comparable to the rate at the largest
allowed value of the $B_s$ mass.
  Finally, we discuss the extraction of the axial pion coupling to $B$ mesons
from measurement of the $B\bbar\pi$ branching fraction in a restricted region
of phase space, where chiral perturbation theory should work well.
