Given the competitiveness of today’s industry, companies must carefully plan their resources to maintain an advantage. Among these resources are the indirect workers, which are often overlooked for not adding value to an organization’s products directly, but whose importance should not be neglected. Thus, this research is aimed at supporting decision-making when it comes to planning supervisors’ tasks. To achieve this, the action research strategy was used. The case company belongs to the Electrical sector and operates in Portugal. In a first stage the fundamental criteria that drive the need for supervisors was proposed, together with the study of the activities of the production supervisors to comprehend which activities they perform and how much they occupy them, according to the characteristics of each work centre This involved performing several analyses such as work sampling, shadowing, and analytic hierarchy process. Then, in a second stage an Excel tool was developed that allows the user to distribute the work centres across the supervisors and verify how balanced the allocation is, together with their occupation rates. The usage of the developed tool provides companies with an objective method of guaranteeing that the supervisors have the capacity to perform their tasks appropriately. By using the supervisors’ tool, a new supervisory allocation through the work centres was proposed for the case researched company, that reduced the mean absolute deviation of the distribution from 12% to 3%.