  Starting from Jacobi-Trudi's type determinental expressions for the Schur
functions corresponding to types $B,C$ and $D,$ we define a natural
$q$-analogue of the multiplicity $[V(\lambda):M(\mu)]$ when $M(\mu)$ is a
tensor product of row or column shaped modules defined by $\mu$. We prove that
these $q$-multiplicities are equal to certain Kostka-Foulkes polynomials
related to the root systems $C$ or $D$. Finally we derive formulas expressing
the associated multiplicities in terms of Kostka numbers.
