Generating complex multimode entanglement is a central goal of quantum information science. However, scalable creation of genuine multipartite entanglement is challenging as it requires excellent control and efficient state verification. We report the generation and transfer of genuine multimode entanglement across two multimode acoustic resonators. We prepare genuine multipartite entangled states involving two, four, and six modes across the resonators with respective fidelities of 0.912 ± 0.003, 0.790 ± 0.003, and 0.570 ± 0.001. We further demonstrate the transfer of two- and four-mode genuine entangled states between the resonators with fidelities of 0.785 ± 0.006 and 0.601 ± 0.006. This hardware-efficient and scalable architecture enables deterministic control and generation of complex multimode mechanical states. Our results push the boundary of quantum control in macroscopic mechanical systems, establishing a pathway toward large-scale mechanical quantum networks.