  We propose a simple ansatz that allows to generate new exactly solvable
multi-state Landau-Zener models. It is based on a system of two decoupled
two-level atoms whose levels vary with time and cross at some moments. Then we
consider multiparticle systems with Heisenberg equations for annihilation
operators having similar structure with Shr\"odinger equation for amplitudes in
multistate Landau-Zener models and show that the corresponding Shr\"odinger
equation in multiparticle sector belongs to the multistate Landau-Zener class.
This observation allows to generate new exactly solvable models from already
known ones.
  We discuss possible applications of the new solutions in the problem of the
driven charge transport in quantum dots.
