I think this is best done through current state process/policy mapping for each business via workshops. Once everyone is aligned on what current state is, then the team should map their ideal future state. The future state mapping should include customer value mapping. Then, it’s an exercise of understanding which pieces from each business fit best into the ideal future state. Another consideration are the system and IT infrastructure requirements to support the process. If each business has a different application (e.g., ERP), then the team should run an analysis of the systems and determine which system best fits with the ideal process while also considering the age of the application and maintenance and upgrade costs.