. Click the icon to expand 
or collapse 
the sub-assembly in the BOM.In this display of the Bill of Materials contents, you can move rows up or down, group and ungroup rows, hide or show columns, and expand or collapse sub-assemblies in indented BOMs.
To edit Bill of Materials Contents:
In the Bill of Materials, Column, Cell Properties, or Table PropertyManager, click BOM Contents.
Edit properties as described below, then click Apply.
Click OK.
Expand/collapse
sub-assembly . Click the icon to expand or collapse the sub-assembly in the BOM.
Show ballooned states 
. The icon shows whether the component has a
balloon or not.
Toggle row visibility 
. Click the icon to hide 
or show 
the row. A gray background indicates that the component is
hidden in the Bill of Materials.
Row up 
or Row down 
. Select a row
and click to move the row up or down.
To keep the item number with
its component when reordering rows, click 
Do
not change item numbers in the Bill
of Materials PropertyManager.
Group 
and Ungroup 
. Select two or
more rows to group the components under one item number. To dissolve the
group, select a member and click Ungroup.
To hide a column in a bill of materials:
Click the column header to hide. Columns in gray indicate hidden columns.