This master thesis deals with optimizing material and information flow between the production plants and warehouses during the reconstruction of the manufacturing plant of Schäfer in Hranice na Moravě. At first, a theoretical introduction to the issues of inter-company transport services is presented. This introduction is followed by an analysis of the current state of material and information flow at the manufacturing plant. The practical part of the thesis consists of a simulation model made in the Tecnomatix plant simulation program. This simulation model includes the plant's current and future states and a layout of future material flow between the welding shops and warehouses. It also contains a conceptual design of the material flow. ...