System equivalent model mixing (SEMM) is a substructuring-based dynamic expansion method that has recently undergone reformulation for its application in the modal domain, resulting in M-SEMM. This chapter aims to present the practical aspect of the method, beginning with a concise overview of the implementation-relevant equations. Subsequently, we introduce a substructuring laboratory testbench, for which a full-field response is obtained by laser scanning vibrometer. Different expansion case studies are examined, showcasing the capabilities of M-SEMM. Additionally, the performance of the method is compared to one of the most established expansion methods in the modal domain, system equivalent reduction/expansion process (SEREP). The results highlight the practicality and potential of M-SEMM as a novel modal expansion method.