Subcontracting - By Product sent direct to Vendor

Hi Guys,

I have a scenario;

We buy 10 tonnes of material from a farmer

This does not come to us.

It is delivered to another vendor to screen the material and remove unwanted stuff.

9 tonnes will be clean and returned to us.

The remainder tonne does not be delivered to us.

Half a tonne is sent straight to another Vendor as it is used in an Animal feed product

The other half a tonne is scrapped by the Vendor after screening

Is there any standard process that can be used for this i.e BOM set up etc

Can you set up a subcontracting PO where you can goods receipt by product to another Vendor, which will be part of another sub-contracting process

The scrap part seems straight forward