Has anyone got the post office record count piece to work.

I am trying to query the record count of 2 or more postoffices and place
the user in the least populated post office.

I would like to build the the query with policy builder.

I have tried the example in the Groupwise docs but keep getting errors.

I need to know where to place the query to determine the count and the
syntax to facilitate the count.

Assistance is appreciated.