One Sales Doc type can hav Order-Relat-Bill & Delivery-Relat-Bill same time

Dear SAP Gurus

Can one Sales Doc type can have Order-Related-Billing & Delivery-Related-Billing at the same time. ( means either we can bill with reference to order , OR we can bill with reference to delivery ).

If currently that Sales Doc Type Billing is Order related and it is working fine. what additional configuration requried. for this Sales Doc type will work for billing , Delviery related as Well.

Regards\Adnan