  We construct an injective weight-preserving map (called the forgetful map)
from the set of all admissible subsets in the quantum alcove model associated
to an arbitrary weight. The image of this forgetful map can be explicitly
described by introducing the notion of "interpolated quantum
Lakshmibai-Seshadri (QLS for short) paths", which can be thought of as a
generalization of quantum Lakshmibai-Seshadri paths. As an application, we
reformulate, in terms of interpolated QLS paths, an identity of Chevalley type
for the graded characters of Demazure submodules of a level-zero extremal
weight module over a quantum affine algebra, which is a
representation-theoretic analog of the Chevalley formula for the
torus-equivariant $K$-group of a semi-infinite flag manifold.
