Modeling Composite Views for Use in Business Process Management 
You can use Visual Composer composite views as the UI for human activity tasks modeled using Business Process Management (BPM).
More information: Assigning a User Interface to a Task
Guidelines
When creating Visual Composer composite views for use in Business Process Management, note the following:
Each component must contain start and end points
Start and end points provide the interfaces between Visual Composer and Business Process Management
Each end point represents a different result state
Note
In Business Process Management, if you generate a Visual Composer UI for task, and you later modify the Visual Composer model without deploying it in Visual Composer, you must choose Validate in the Deploy task panel to be able to view the generated Visual Composer UI in Business Process Management.