  Topological defects such as monopoles, vortices and "chains"of the SU(3)
gauge group are studied using its SU(2) subgroups. Two appropriate successive
gauge transformations are applied to the subgroups to identify the chains of
monopoles and vortices. Using the fact that the defects of the subgroups are
not independent, the SU(3) defects and the Lagrangian are obtained and compared
with the ones provided by Cho decomposition method. By comparing the results
with the ones which have been obtained directly for the SU(3) gauge group, the
relation and possible interactions between the defects of the subgroups are
discussed.
