Phantom Material

Dear SAP Gurus,

1.If ‘A’ is a phantom material having set of parts. Set of parts are B, C and D. What is the configuration required to sell or procure these three parts in a set?

2.What is the difference between, if I set the phantom assy in MRP-2 (special procurement key-50) view rather than in BOM item? Please give example on both cases.

Thank you,

Regards,

Sudip