  Boundary effects are crucial for dynamics of dilute charged gases governed by
the Vlasov-Poisson-Boltzmann (VPB) system. In this paper, we study the
existence and regularity of solutions to the VPB system with soft potential in
a bounded convex domain with in-flow boundary condition. We establish the
existence of strong solutions in the time interval $[0,T]$ for an arbitrary
given $T>0$ when the initial distribution function is near an absolute
Maxwellian. Our contribution is based on a new weighted energy estimate in some
$W^{1,p}$ space and $L_x^3 L_v^{1+}$ space for soft potential. By using the
classical $L^2$--$L^\infty$ method and bootstrap argument, we extend the local
solutions from small time scale to large time scale.
