@Guest - can you provide more details on how you would like to query quantities by Work Area?
Would you like something different from our team's response below? If yes, can you briefly describe how you would like to see it?

Here is our team's response. Modeler has the ability to filter Cost Code assignments by work area.
Assignments widget -> Select Filter by = Work area -> Select existing work areas

Also, work area info is displayed in the exported Excel fil,e and data can be filtered there:
Assignments widget -> Export to Excel