In this point, a Methodology for the reallocation of inventory to orders in LHP situations (MERIO-LHP) is proposed. Following this methodology, any company can make a reallocation of inventory to orders integrated with its information system and based on a mathematical model and objective criteria. This will avoid a lot of unnecessary work, duplicity of data, errors, and the dependence of a specific person. This methodology is composed of six steps as can be shown in the next figure (Fig 2), and is independent of the information system that the company may be using, so it can be used in any business environment. In the next paragraphs, each step of the methodology is briefly explained. Subsequently, the following section presents a case study where a model-based DSS was developed to support this methodology in a real situation.