You need to configure production operations for the pine and orange scent solutions.

Configure the inventory policy for the item model group to set the value of the Stocked product option to Yes.

Use a purchase agreement as a service agreement.

Allocate subcontracted work in its own cost breakdown block.

Configure a costing resource and requirement to point to a Vendor type resource.

Configure the BOM line to be of type Vendor and associate the corresponding vendor account.