how to procure 3 items in one material code

Hi MM Guru's,

Good Day

Currently, we sign up from a new vendor and the requirement is like this

When we order material X from them, they already know that these consist of 3 items (say a,b,c).

In short will only raise one item but they will deliver to us 3 items.

My users don't want to manually enter the three items in the PO, they want that when the material X has forecast, the three items is automatically there in PR once conversion.

Can this be done in SAP?

As i know, in inhouse production it can be done using phantom assembly, but I am not sure whether what to do in procurement side.

Hoping for your positive feed backs.

Thank you.