Hi Pragti,
As per your requirement you want to create MDR for standard BO, which is not possible. You can only create MDR for custom BO but there is workaround to update standard BO.
First you should read the details of MDR , as pradeep suggested go through this link.
then for standard BO you should first create custom BO with query and action.
then in action you should write a logic to update customer BO. This below link has used similar use case. How to create an hourly mass data run in C4C | SCN
Let us know if you face any difficulty.
Regards
Sunil