Ramagiri thanks for reply.
My point is to make one BOM1 and (if there is any way to) assign rest of the materials having same component to BOM1.
In this case I need to maintain one BOM and i can assign 100s of materials to same BOM. further If i will change any thing in BOM it will reflect for all assigned materials with just one change.
what you have stated I need to maintain different BOMs for different materials, which is not solving the problem.
Regards