This document explains how we can do the mass update for a BOM.I feel that this is a basic question asked in the forum for many times .
Massly we can update a Existing BOM by CS20 OR CEWB Transaction
1. Tcode CS20
First select relevant option 1) user wants change item data
2) Delete material
3) Add Material
4) Add Document
5) Add class
After that you can update following field Quantity
costing relevancy indicator
But it is difficult to remove costing relevancy indicator through CS20 if it is defined as blank in the system .
For that process we will use another Tcode CEWB
Give current working area as SAP_ITEM
Go to item tab in the component field give the component code ( for which user wants to do the changes in all Bom)
click on Load BOMS & Tasklists Data.
Select Bom for which user wants to do the changes & click on Edit/Lock Button
After that Field will became Editable user have to change the fields & save
Now BILL OF MATERIAL has changed as per requirement massly.
Thanks & Reagrds
Sandeep Kumar Praharaj