Hello, I need to manage a production process that is done partly by an external supplier;

This is what I need to manage: I purchase the product A from Supplier1 that send the ProductA to Supplier2.

The supplier2 process the ProductA and trasforming it to ProductB (ProductA + chemical processing)

I receive productB from Supplier2

How can I manage this ?

I tried to configurate routes without success and in production management can not choose an external warehouse in manufacturing orders...

I need some suggestions to know how manage this

Best regards