In the Model Tree view, you can see the components in the model in different hierarchies: Containment, Component, Layer and Federated Floor. With the four different hierarchies, you can find particular components in the easiest way possible.
For example, if you are about to run an ITO on the ground floor of the model then the Federated Floor hierarchy would be the best to use - but if you want to work with the walls only, the Component hierarchy is the best option.
The four hierarchies:
Containment (): Components are organised by their construction types in the class hierarchy (following the IFC schema: file, site, building, floors, components).
Component (): Components are organised by IFC component types (following the components in the building, component and type).
Layer (): Components are organised by the layers exported from the authoring tool (in the case of Revit, the Family Names are used). Layer hierarchy is based on layers that have been created in the authoring applications.
Federated Floor (): Logical restructuring of components from different models into a singe floor structure. Models where the global level of the floors overlap will be evaluated and components are shown on the appropriate federated level. This is a special relation created by Solibri and it doesn't affect IFC relations.