BOM Assembly Structure and Balloons

You can expand a BOM to view the assembly structure. For models with balloons, the assembly structure column is preceded by a per-component listing of balloons.

A thumbnail preview is available for each item in a BOM when you hover over its icon in the assembly structure column. If a component's preview does not appear when you hover over its icon, open and save the component, then hover over the icon again.

Unexpanded BOM Expanded BOM showing assembly structure and thumbnail preview