A unit is a structure or hierarchy level in process4.biz. Units thus serve as a container for the collection and allocation of diagrams and objects.
Units can be named as you wish, are in the bottom of the navigation window in the repository and comprise of a hierarchical branch for data and one for diagrams as well as other branches for subordinate = deeper child-units.
Data and charts from higher parent-units can be inherited in deeper levels of hierarchy.
Units of the demo database in the Database Designer