You can dissolve components of subassemblies or weldments in a bill of materials (BOM).
To dissolve one or more selected subassemblies or weldment parts in a BOM:
-
Click the left side
of the BOM table to display
the assembly structure column in the BOM if it is hidden.
-
Right-click one or more selected cells in the assembly
structure column that contains a set of subassemblies
or weldment parts 
.
-
Select Dissolve.
Modified items are marked
.
To undo one or more dissolves, right-click a cell in the
assembly structure of the BOM indicating dissolved items and select
Restore Restructured Components.