New 'Role' column based on values

I am looking to have a new column created called ' Role' to show the persons role in the company. People can change roles and the role is based on the cost centre and site they are at.

Dataset below:

I am looking to have a new column created to show the Role of the person based on their cost centre and site. E.g Emp 123456 should be showing as role ' Customer Services' as cost centre is 225 and site HO. Previous to this, emp was 'Finance' as cost centre was 101 and site UK etc...

Thanks!