Nesting Case statements?

Summary

Is it possible to nest Case statements in otbi?

Content

I am working on a recurring report that requires me to classify people based on certain characteristics.  I am wondering if it is possible to nest case statements.  I'm trying to do something along these lines -- for specific individuals, they should be flagged as senior management, otherwise categorize them into different buckets using Business units.  This is the syntax I'm using:

CASE "Worker"."Person Number"

WHEN '111111' THEN 'Sr Mgmt'

WHEN '222222' THEN 'Sr Mgmt'

WHEN '333333' THEN 'Sr Mgmt'

WHEN '444444' THEN 'Sr Mgmt'