OBJECTIVES: To describe the process used to build capacity for wider dissemination of a Total Worker Health® (TWH) model using the infrastructure of a health and well-being vendor organization. METHODS: A multiple-case study mixed-methods design was used to learn from a year-long investigation of the experiences by participating organizations. RESULTS: Increased capacity for TWH solutions was observed as evidenced by the participation, plans of action, and experience ratings of the participating organizations. The planning process was feasible and acceptable, although the challenges of dealing with the COVID-19 pandemic only afforded two of the three worksites to deliver a comprehensive written action plan. CONCLUSIONS: A suite of services including guidelines, trainings, and technical assistance is feasible to support planning, acceptable to the companies that participated, and supports employers in applying the TWH knowledge base into practice.