Billusersum is a custom report you got from Emory.

In it the Bill Selection Phase is actually RUN first.
If, in this phase, you select, 5) Balance Owed, it will select bill
records that have a balance owing of, say, greater than $0.00
and less that $10.01 PER BILL.

The report then goes on to select user information for each
selected bill. It then puts that file, that (happens) is in user key
order, through an awk script sumbills.awk which creates file of
records of one record per user key with a count of the number
of selected bills PER USER and the TOTAL BALANCE
OWED PER USER.

This file of total balances per user is then put through the
Balance Phase to select user records by the total balance owed
for all the SELECTED bills for a user.

The resultant file is then sorted by either user id or user name
and a list of the selected total balances of the selected bills for
users is printed using another awk script called prtbill.awk.

Say we have a user who has two bills for $5.00 each.
If you selected for greater than $9.99 in both the Balance Phase
and the Bill Selection Phase, nothing would be printed for this user
because both bills would NOT be selected by the Bill Selection
Phase. If you only selected for greater than $9.99 in the Balance
Phase, a balance owing of $10.00 would be printed for the user.

Say we have a user who has two bills, one for $5.00 and the other
for $10.00. If you selected for greater than $9.99 in both the
Balance Phase and the Bill Selection Phase, a balance owing of
$10.00 will be printed for this user because the $5.00 bill would
NOT be selected by the Bill Selection Phase. If you only selected
for greater than $9.99 in the Balance Phase, a balance owing of
$15.00 would be printed for the user.

So, if the intended use of this report is to selectively report on the
TOTAL BALANCE OWED BY A USER, I would highly
recommend that you enter nothing other than maybe greater than
$0.00 in 5) Balance Owed of the Bill Selection Phase.