IEEE802.1Qbv (Time-aware Shaper: TAS) in IEEE802.1-Time-Sensitive Networking (TSN) has recently been applied within user networks (NWs) for realizing factory automation and remote control. TAS enables the coexistence of low-jitter traffic and best-effort traffic required in industrial NWs and enables deterministic control of communication latency. As mass customization matures, TAS is expected to extend its application coverage to not only user NWs but also wide-area NWs to enable real-time communication for remote control and cloud-based application use. TAS is TSN technology expected to be used for long-distance communications because it can guarantee maximum latency limits. However, designing a TAS schedule is known to be an NP-hard problem, which becomes more difficult as the number of forwarding hops increases. In this paper, we propose a method to solve the TAS design problem in large NWs by combining TAS design in smaller NWs; the NW is divided into several domains. We show that TAS solves the problem of large forwarding hop counts and improves schedulability when implemented in large NWs. This paper contributes to the realization of TAS in the wide-area NW, which has not been discussed so far.