Implementing Row level Security to hide sensitive data

Hi all,

Would appreciate your help in this. 

We have a matrix where under the rows section we have below columns

City Name

Branch Name  

Employee Name

and under the Value Section We have

Total Leave

Sick Leave

Annual Leave

All the above fields are from a single flat table.

The requirement is out of 50 users 10 users should see the data for all the rows ( City Name , Branch Name,Employee Name)

but other 40 users should see data only for ( City Name , Branch Name). In other words, they should not see Data at Employee Name Level.

Please advise any easy way to implement this security.