Map the shared records
Begin with the entities that several workflows genuinely need: people, companies, opportunities, transactions, tasks, messages or operational assets. Define ownership and the minimum data needed before discussing screens.
Connect one useful workflow at a time
A master CRM can bring together Lead CRM, KPI CRM, POS CRM, Password CRM and Mail CRM. Each module should have a clear purpose, permissions and handoff so the system stays understandable as it grows.
Release with a measurable operating change
Document the data model, integrations, roles, reporting rhythm and recovery path. Then release a focused slice, train the people who own it and use real feedback to decide what connects next. That is the role of a bespoke master CRM: shared control without unnecessary complexity.