How to ship back subcontracting materials from vendors to company .

Hi

Our client is delivering subcontracting materials to vendors using ME2O transaction .

She is asking me how can I ship back materials from vendors to company .

Example :

Shipped 236.C from company to vendor .

Now we need to ship back 236.K from vendor to company .

Could you brief me T codes to be used and entire process in step by step .

Thanks In Advance