Sub assembly for finish product

Hello All

I have following requirement.

finish product YF1 has sub assembly YI1 and YI2.

My requirement is to drive demand for both sub-assemblies through finish product YF1.

I want to consume YI1 into YF1 but i dont want to consume YI2.

Yi2 will be sent separately to customer.

Please let me know, how to map this scenario

.