Mixed reality is a very useful and powerful instrument for the visualization of processes, including the assembly process. A Mixed Reality based step-by-step furniture assembly application is introduced. On the one hand context related actions are given to the user to install elements. On the other hand an intuitive way for authors to create new MR based assembly instructions is provided. Our goal is to provide a powerful, flexible and easy-to-use authoring wizard for assembly experts, allowing them to author their new assembly instructor for hierarchical structures. This minimizes the costs for the creation of new mixed reality assembly instructors.