How To Avoid Duplicates In Append Query

Hi all,
I have an append query that I run daily and want to append only records with
different OrderID.
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INSERT INTO tblConfirmSchedule ( OrderID, JobCode, JobDate, Status, [Home#],
[Work #], Ext, [Other#], Ext2 )
SELECT Orders.OrderID, [Schedule Info].JobCode, JobSchedule.JobDate,
JobSchedule.Status, CustNew.[Home#], CustNew.[Work #], CustNew.Ext,
CustNew.[Other#], CustNew.Ext2
FROM (CustNew INNER JOIN Orders ON CustNew.CustomerID=Orders.CustomerID)
INNER JOIN ([Schedule Info] INNER JOIN JobSchedule ON [Schedule
Info].JobCode=JobSchedule.Scheduled) ON Orders.OrderID=[Schedule Info].OrderID
WHERE (((JobSchedule.JobDate)>Now()+3) And
((JobSchedule.Status)="Scheduled"));
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Any ideas?
Thanks in advance,
Emilio