  For the root systems of type $B_l, C_l$ and $D_l$, we generalize the result
of \cite{DZ1998} by showing the existence of Frobenius manifold structures on
the orbit spaces of the extended affine Weyl groups that correspond to any
vertex of the Dynkin diagram instead of a particular choice made in
\cite{DZ1998}. It also depends on certain additional data. We also construct LG
superpotentials for these Frobenius manifold structures.
