Updating a Value in a Column

HI All,

I have a data set where i am trying to update particular values thats missing manager name as per those values in the same column that include a manager name.

In the above table, i want to update the values "SALES" to "SALES (ROB)" or FINANCE to FINANCE (John)  . How do i do this.  I tried splitting the columns but i am unable to get the manager name associated to the rows where the entry is missing.

Thanks

SR