  In an earlier paper we have proposed a novel method to compute the decay
width for a general $1\to n$ cascade decay where the propagators are off-shell
and may be of different spins. Here, we extend our algorithm to accommodate
those decays that are mediated by more than one such cascades. This generalizes
our prescription and widens its applicability. We compute the three- and
four-body toy decay chains where identical final states appear through
different cascades. Here, we also provide the algorithm to calculate the
interference terms. For four-body decays we discuss both symmetric and
asymmetric cascades, providing the expressions for the detailed phase space
structure in each case. We find that the results obtained with this algorithm
have a very impressive agreement with those from standard softwares using a
sophisticated Monte Carlo based phase space integration.
