In this article, we describe the development of a modular online optimization solution. This solution can be configured to deal with different plant layouts and therefore allow for a re-usable and hence profitable advanced optimization solution. The industrial process for which the model was developed is divided into separate stages. Each stage represents a production step, which may or may not be present in a particular plant. Inputs and outputs of each stage are defined in a flexible way to ensure that the sequence of the production stages can vary and can be easily connected. Optimization results are shown for two alternative plant configurations and are discussed together with the benefits and cost that come with the pursuit of a modular solution.