Multi-domain prototyping is promising yet complex for designing communications networks and networked systems. Mutli-domain simulation requires creating multiple simulation models or virtual prototypes of the systems from varying viewpoints. The paper focuses on creating cohesive models from multiple disjoint models. The paper discusses specific support requirements for cohesive model building as they pertain to the advanced communications system design. The paper then proposes a multidomain prototyping method based on the View Integration theory of data engineering. The paper demonstrates two implementation approaches of the proposed method. A case study based on TINA (Telecommunications Information Networking Architecture) is used to compare the proposed approaches with the current approach.