Definition
The building hierarchy depicts the relationships between the various building units.
Use
You create these relationships by subordinating a building unit to another building unit.

In this way, you assign bed locations to sickrooms, for example.
Structure
The category of the building units determines whether you can assign one building unit to another. In Customizing for IS-H, you specify which building categories may be assigned to each other.
In Customizing for IS-H, you assign the type of building unit to each category. Types of building units are predefined in the system. The type determines how a building unit can be used in subsequent functions. For more information about this, see the sections entitled Define Building Unit Categories, Maintain Hierarchy of Building Unit Categories and Assign Building Unit Categories to Org. Unit Categories in the IS-H Implementation Guide.

For instance, you can use the type of building unit to distinguish sickrooms from care unit rooms. In the hierarchy, you can assign bed locations to sickrooms but not to care unit rooms.
You can maintain the building hierarchy explicitly. Additionally, you can maintain the building hierarchy when creating or changing building units using the collective entry function.
See also:
Maintaining the Building Hierarchy Changing Building Units: Collective Entry Changing Building Units: Collective Entry Displaying the Building Hierarchy Overview