Free sample sale procedure in SAP SD

Dear Experts,

One our client wants to implement free sample sale process in there system. Please let us know what is the procedure for that and also let us know about pricing procedure of free sample sale.

In this particular scenario our client does not want to hit the Customer A/c. and Journal entry for this would be as follows in T Code VF01:

BED Payable A/C

To Sale of free samples A/c

Please send us configuration setting for the same.

Thanks & Regards,

SAP SD Team