This final paper addresses the significance of commerce in general, with a special focus on wholesale processes in commerce. The paper covers an introduction to commerce, its historical development, the scope of its functions, as well as its classification and significance. Furthermore, it deals with the role of wholesale in distribution channels, whether and to what extent its role of an intermediary in commerce is necessary and desirable, and identifies base functions of commerce as well as all the participants in the distribution channel. The most significant part of the final paper focuses on the topic of the wholesale process based on the case study of Oskar d.o.o. company. The case study covers the very foundation of the company, the location of its wholesale centres, the organisation of its supply system, warehousing and storage capacity increase plans, and the distribution system. In its final part it describes the sales system in the company, its organisational structure, a description of jobs in the wholesale sector, the segmentation of buyers in terms of generated revenue, as well as the company's future plans to increase their competitiveness as to modern business trends in order to maintain sustainability in the long run.