creating HCM provision role is it by grade code or grade name?

Hello,

We would like to update the ROLE PROVISION with a new rule that is based on the

GRADE field of the employee. 

Do we need to duplicate and have a SEPARATE mapping provision role for each GRDAE CODE ? or is there any way to have it mapped to grade name .? 

In case for the same code name we have many different GRDAE CODES -for example - M5 - had M_1 , M_2 , M_3 grade codes. BUT each of them should be mapped to to the SAME role in fusion - for example to Line manager role . - see attached file.