Ok so your combo box with the list of activators is correctly showing WHO can possibly be assigned the task but you want to evenly distribute the workload over those 'activators' and pick the person with the lowest number of accounts to handle.
So what you want is a 'suggested' activator (which presumably they can change if they want to).
There are a couple of ways you can do this fairly easily. The first is to create a list box with a summary of your activators and how many current accounts they have so from your BANKERS table it would be a query something like
SELECT Assigned, Count(Assigned) as AccountsActive FROM Bankers GROUP BY Assigned ORDER BY Count(Assigned) DESC
Then in the ON CLICK event of the list box you would have
ASSIGNED = Lst_AssignedList
where ASSIGNED would be the name of your data entry field and Lst_AssignedList would be the name of the list box.
Barring that you would have to do a little coding but it would be the same basic method
in the ON ENTER property of your ASSIGNED combo box field
Code:
dim db as database
dim rst as recordset
dim sSQL as string
set db = currentdb
sSQL = "SELECT Assigned, Count(Assigned) as AccountsActive FROM Bankers GROUP BY Assigned ORDER BY Count(Assigned) DESC"
set rst = db.openrecordset(ssql)
rst.movefirst
ASSIGNED = rst.fields("Assigned")
rst.close
set db = nothing
basically you're opening up the same dataset as if you were going to do it in a list box, read the first value (the person with the lowest number of accounts) and fills in your ASSIGNED field with the id of that person.