For this example, let's say that your table name is CUST, and the field you are using would be CustName
in the properties of your combo box, on the Data Tab, under rowsource put the following:
Code:
SELECT [CUST].[CUSTNAME] FROM CUST GROUP BY [CUST].[CUSTNAME] ORDER BY [CUST].[CUSTNAME]
let me know if this helps you.
Jim.