This paper addresses the problem of developing an optimisation model to aid the operational decision-making process. The model is applied on a real word pipeline oil distribution scenario, which connects an inland refinery to a harbour, conveying multiple types of commodities. The optimisation model was developed based on mixed integer linear programming (MILP) with uniform time discretization. The MILP well-known computational difficulty was avoided by the problem domain decomposition. In the end, simulation examples has demonstrated that the optimisation model was able to define new operating points, providing significant cost saving.