  A finite or infinite matrix $A$ is image partition regular provided that
whenever $\mathbb N$ is finitely colored, there must be some $\vec{x}$ with
entries from $\mathbb N$ such that all entries of $A\vec{x}$ are in some color
class. In [6] and [8], the notion of centrally image partition regular matrices
were introduced to extend the results of finite image partition regular
matrices to infinite image partition regular matrices. It was shown that
centrally image partition regular matrices are closed under diagonal sum. In
the present paper, we show that the diagonal sum of two matrices, one of which
comes from the class of all Milliken-Taylor matrices and the other from a
suitable subclass of the class of all centrally image partition regular
matrices is also image partition regular. This will produce more image
partition regular matrices. We also study the multiple structures within one
cell of a finite partition of $\mathbb N$ $\cdot$
