Are the values in your combo box based on a query or values that you've typed in? If it's a query then just adjust the sort order of the query to reflect the column that you want to a-z. If its values that you've entered yourself then you're a bit stuck. If its only a few rows then you're better off retyping it in. Good Luck
You have an SQL statement as the row source for the combo box.At the end of the statement put this: ORDER BY [TableName].[FieldName] using the field that you want sorted.