How to replicate FOC concept from SAP S4Hana to SAP C4C?

Dear Experts,

In SAP S4Hana we have the concept of free of charge (FOC) products for example: If you buy a product X of 10 boxes you will get 2 boxes of product X for free of charge in sales order.

So we want the same concept to be replicated/configured in sap C4C. does anyone have an idea how this can be achieved in SAP c4c or whether can we achieve this through any work around please suggest.

Thanks in advance.

Regards,
Navaneeth Kumar