Bex Query - how to hide characteristic value for

In Bex Analyzer, I have 2 characteristics and one key figure. One is employee, the other is activity type. Because of salary sensitive issues, for certain activity types, I do not want the employee number to show. However, I do need activity type and key figure (rate) for this record to display so the total for the project will be correct. How do I hide the employee number for selected activity types. See example below.

ProjectEmployee Activity Type Rate (kf)

1000 123 W01 $15

1000 G01 $20

Thanks in advance.

Vicki Tankersley