When creating a record in a service table, I want to be able to select a
customer name in the Customer Field from a table of customers (which I can
do), and then based on that Customer Field, I want to limit the choices of
Customer Locations to the locations that are associated with that customer.  
I have a Customer Location table that lists Customer A: Location 1, Customer
A: Location 2, Customer B : Location Q, etc.  

Is my table setup the optimum way to do this (service table, customer table,
and location table)?

How can I use the Customer name that's selected in the Customer Field to
restrict the locations to the ones that are valid just for that customer?  I
was able to use Query Builder from Row Source to connect the two fields, and
it worked once, but if I changed the Customer Field, I the list of locations
in the combo box didn't change, and then when I went back a little while
later, I would get the same mixed list of locations no matter which customer
I selected.

I'm running Access 2003, and this is the first time I've tried to setup a
database with a connected field, so I may be using the wrong terms to
describe what I'm trying to do.

Thanks