You can use a weldment cut list table to add a BOM-like table for cut, welded structural shapes.
When the first weldment feature is inserted in a part, the Solid Bodies 
folder is renamed to Cut list 
to indicate the items to include in the cut list. The icon indicates that the cut list needs to be updated. The icon 
indicates that the cut list is up-to-date.
Items that appear in the cut list must appear in the Cut list folder at the part level.
The option to automatically organize all of the weldment entities in the cut list is on by default in new weldment parts. To turn it off, right-click
Cut list and clear
Automatic.
Although the cut list is generated automatically, you manually specify when to update it in a weldment part document. This enables you to make many changes, then update the cut list once.