101 movement

Dear All,

We are into process industry and using SAP ECC 6.

In one BOM there are saveral other FGs as component as output. During process order confirmation it shows as by-product i.e. 531 movement.

We required some of them can allow 101 movement.

Will I have create new BOM for that FG or is it possible in existing BOM ?

Pl.suggest

Thank in advance,

Nirav