OSP flow where we need to send the material to supplier and Receive it from supplier after completi

Hi - I need to know about how the below OSP flow work. Please let me know if you have done such things.

We can do below two things via OSP :

1) During manufacturing of my Assembly i can ask my supplier to provide an item, which i will receive directly to my shopfloor and continue with manufacturing in my organization.

2) i can manufacture say 70% of the Final Assembly in my organization and then send the semi finished Product to my supplier for final completion. Supplier will finally complete the remaining 30% of Assembly and send it to me.

I am well aware of set ups need to be done for step1, but not sure how to set up for step2. If anyone has done this please guide me.