In this study we address the multi-product, multi-period, multi-echelon distribution planning problem. The objective of this paper is to present a distribution planning problem in which both rail/road and marine transportation are integrated within a whole focus on supply chain management. Since the products are mainly exported in bulks to overseas customers, the planning of land transportation, and sea transportation is of great importance. The design and use of mathematical programming system is depended on a great extent to the description, manipulation and display of data. We aim to illustrate the potential complexity reduction that can be exploited from the efficient data structure.