Change BOM

Hello SAP Commuinty,

new products are introduced into factory (A), the products BOM was copied and pasted from the other factory (B).

A process that we have introduced in the original factory (B) has not yet been introduced in factory A, Therefore, the BOM that was changed some time ago in the original factory ( I don't know when ) and now has been copied to the new factory. The BOM in the new factory is wrong.

Questions:

1) Can I change all products together?

2) What is the easiest way to change the BOM for a group of products, I find it really impractical to change product by product?

BTW: am brand new to SAP

Best Regards

Kareem