Selection of BOM for a purchase order based on Vendor

Hello Gurus,

We have one material which when ordered from two different vendors should have different components. To make this simple and easy for person creating Purchase Order how should it be implemented?

How should we create BOM that it automatically picks up the right components when a Vendor is chosen in the Purchase Order? We don't want to create two different materials and different BOMs under it. As it is for same product. Please give guidance on this.

Thanks

Regards

Sreepati Hari