Assign components or assemblies

If two structure panes (sometimes called companion panes) are visible, you can select any assembly or component in the BOM tree in one pane and assign it to the BOM tree in the other pane as its children. When you do this, the BOMs share the absolute occurrences of the assigned children. This allows you to search between the BOMs to locate these shared absolute occurrences. You can make such assignments in two ways:

Select the assembly or component and choose Tools→Assign. You can also right-click the selected item and choose Assign from the shortcut menu.

-or-

Right-click the selected item and choose Assign As from the shortcut menu. You can then specify the occurrence type for the assigned component.