Select Multiple Rows Depending On Value Of A1?

I have a spreadsheet with employees and data listed. The drop-down in A1 lets someone select the employee and then it hides the rows for all other employees. I want to add the names of supervisors in the drop-down of A1 and have it select only the employees under that supervisor and hide the rest. The number of employees under each supervisor ranges from 3 to 6. This is what I have to hide the rows when selecting a single employee :

[Code] .........

My workbook has stats data on the "Master" sheet(sheet #1) and analysts and supervisors on "Analysts" sheet(sheet #12). Data validation for cell A1 on "Master" sheet has all the analysts and supervisors in the first column of "Analysts" sheet with title "Select Analyst" in cell A1. I modified the "Analysts" sheet to show supervisors from B1:I1 and listed the analysts in the appropriate columns below them. Not sure how to make it select the analysts when someone selects the supervisor on "Master" sheet .