How would you modify a SQL Statement for the addition of another table to join (to filter out records in Access 2003)?

In the following INSERT statement, how would I add the following qualifier:
where (C.Officenumber + C.CustomerNumber) = dbo.tblSpINTMatch.[Account Number]


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INSERT INTO dbo.tblSpINT([Account Number], [Address 1], [Address 2], [Address 3])
SELECT Right(C.OfficeNumber,3) + ' ' + C.CustomerNumber AS [Account Number], UPPER(C.Address1)
As [Address 1], UPPER(C.Address2) As [Address 2],  UPPER(C.Address3) As [Address 3]
FROM dbo.tblStatesAll  As S INNER JOIN (dbo.tblCustomersNew As C  
INNER JOIN dbo.tblProductsNew As P  
ON C.CustomerNumber = P.CustomerNumber AND C.OfficeNumber = P.OfficeNumber)
ON S.StateFS = C.ResStateCode