Promo BOM components - Best Practice

Hi Gurus,

My client's requirement is that they come up with promos at regular interval.

How to map the additional components used for promo in SAP?

Is it advisable to change the BOM to accomodate the components or can we go and change/add components in production order itself?

Well, at this moment we have decided to go for changing the components in production order and do not change the BOM.

Is this best practice?

Do we have any alternate other than these two options?

Cheers,

Himanshu