I have two object Offer discount matrix (Custom object) and Order Product (Standard).Offer discount matrix is master table with Discount code and Discount% field. Oreder Product object have Total Discount% field.
whenever any new Order product add how to campare Total discount% in Order Product and Discount% in Offer discount matrix and if it matches populate discount code in Order Project object field.
Note  :There is no any relationship between these two object 
How to achive this requirement? need your expertise.

Thank you in advance.

I have two object Offer discount matrix (Custom object) and Order Product (Standard).Offer discount matrix is master table with Discount code and Discount% field. Oreder Product object have Total Discount% field.
whenever any new Order product add how to campare Total discount% in Order Product and Discount% in Offer discount matrix and if it matches populate discount code in Order Project object field.
Note  :There is no any relationship between these two object 
How to achive this requirement? need your expertise.

Thank you in advance.