Changing How a Computed BOM Hierarchy Displays

In the View (left) section of the BOM toolbar, expand the BOM View flyout BOM_UI_Indented and select one of the following:

BOM_UI_Indented Indented Parts and subassemblies are indented from their parent assemblies in this hierarchical view (default).
BOM_UI_Parts_Only Parts Only Only parts are listed in the BOM in a flat view. Quantities for parts referenced by more than one subassembly are accumulated.
BOM_UI_Top_Level_Only Top Level Only Only top level entries in the BOM list are displayed.
Flattened Parts and subassemblies are displayed in a list without indentation. The component is displayed only once in the list if it is present at multiple levels in the product hierarchy. The component quantity is displayed by adding the quantities at each level.