How are components (materials) provided to vendor? | SAP-MM

The components, rather the quantities of the components required to manufacture the end product, are provided in the stock of material to be provided to the vendor. The stock of material provided to the vendor is the total valuated stock that is available for MRP. This stock is managed at the plant level at the site of the vendor. This stock can be either an unrestricted use or quality-inspection stock. The unrestricted-use stock refers to the valuated stock of a material that is owned by the company and does not have any restrictions on its usage. The quality inspection stock is intended to be used only for quality inspection.
 The components can be provided to a vendor in the following
=>    Posting the components from the unrestricted-use stock
=>    Receiving the components from another vendor.