Need a suggestion on how to revise this query

This is what I have:

Select
PR.WBS1,
PR.WBS2,
PR.WBS3,
PR.LongName,
PR.Name,
CL.Name as CLIENTNAME,
CFGMain.FirmName,
CFGMain.Address1,
CFGMain.Address2,
CFGMain.Address3,
CFGMain.Address4,
Contacts.FirstName + ' ' + Contacts.LastName as CONTACT,
isnull(LB.AmtBud, '0.00') as AmtBud,
Sum(LD.BillExt) as BillExt
From PR
left join Contacts ON PR.ContactID = Contacts.ContactID
left join CL ON CL.ClientID = PR.ClientID
left join LB ON LB.WBS1 = PR.WBS1 AND PR.WBS2 = LB.WBS2 AND LB.WBS3 = PR.WBS3
left join LD ON LD.WBS1 = PR.WBS1 AND PR.WBS2 = LD.WBS2 AND LD.WBS3 = PR.WBS3 And LD.BilledPeriod = '200408',
CFGMain
Where (PR.WBS3 <> 'ZZZ') and (PR.WBS2 <> 'ZZZ')
Group By PR.WBS1, PR.WBS2, PR.WBS3, PR.LongName, PR.Name, CL.Name, CFGMain.FirmName,
CFGMain.Address1, CFGMain.Address2, CFGMain.Address3,
CFGMain.Address4, Contacts.FirstName, Contacts.LastName,
LB.AmtBud

Right now I have a column that takes the sum of LD.BilledPeriod when equaled to '200408'. The problem is that I need to include another column that also calculates the sum for BillExt where LD.BilledPeriod <= '200408'. Ordinarily I would have done a subquery which I have tested and it does work. But, I have to find another way of doing this because when I add subqueries other functionality in the software I using does not work. So, I am hoping that someone might know another route for me to take. I was thinking about using a UNION but this will not create a new column that I need.

Thank You,
LauraOk, I think I might have solved it by using CASE.

SELECT PR.WBS1, PR.WBS2, PR.WBS3, PR.LongName, PR.Name, ISNULL(LB.AmtBud, '0.00') AS AmtBud,
SUM(CASE WHEN LD.BilledPeriod <= '200408' THEN LD.BillExt ELSE '0' END) AS BTD,
SUM(CASE WHEN LD.BilledPeriod = '200408' THEN LD.BillExt ELSE '0' END) AS BillExt
FROM PR LEFT OUTER JOIN
LB ON LB.WBS1 = PR.WBS1 AND PR.WBS2 = LB.WBS2 AND LB.WBS3 = PR.WBS3 LEFT OUTER JOIN
LD ON LD.WBS1 = PR.WBS1 AND PR.WBS2 = LD.WBS2 AND LD.WBS3 = PR.WBS3
WHERE (PR.WBS3 <> 'ZZZ') AND (PR.WBS2 <> 'ZZZ') AND (PR.WBS1 = '001-298')
GROUP BY PR.WBS1, PR.WBS2, PR.WBS3, PR.LongName, PR.Name, LB.AmtBud

Thanks,
Laura|||That was painful...good luck

Select * FROM (
SELECT
PR.WBS1,
PR.WBS2,
PR.WBS3,
PR.LongName,
PR.Name,
CL.Name as CLIENTNAME,
CFGMain.FirmName,
CFGMain.Address1,
CFGMain.Address2,
CFGMain.Address3,
CFGMain.Address4,
Contacts.FirstName + ' ' + Contacts.LastName as CONTACT,
isnull(LB.AmtBud, '0.00') as AmtBud,
Sum(LD.BillExt) as BillExt_200408
From PR
left join Contacts ON PR.ContactID = Contacts.ContactID
left join CL ON CL.ClientID = PR.ClientID
left join LB ON LB.WBS1 = PR.WBS1 AND PR.WBS2 = LB.WBS2 AND LB.WBS3 = PR.WBS3
left join LD ON LD.WBS1 = PR.WBS1 AND PR.WBS2 = LD.WBS2 AND LD.WBS3 = PR.WBS3 And LD.BilledPeriod = '200408',
CFGMain
Where (PR.WBS3 <> 'ZZZ') and (PR.WBS2 <> 'ZZZ')
Group By PR.WBS1, PR.WBS2, PR.WBS3, PR.LongName, PR.Name, CL.Name, CFGMain.FirmName,
CFGMain.Address1, CFGMain.Address2, CFGMain.Address3,
CFGMain.Address4, Contacts.FirstName, Contacts.LastName,
LB.AmtBud) AS A
JOIN (
SELECT
PR.WBS1,
PR.WBS2,
PR.WBS3,
PR.LongName,
PR.Name,
CL.Name as CLIENTNAME,
CFGMain.FirmName,
CFGMain.Address1,
CFGMain.Address2,
CFGMain.Address3,
CFGMain.Address4,
Contacts.FirstName + ' ' + Contacts.LastName as CONTACT,
isnull(LB.AmtBud, '0.00') as AmtBud,
Sum(LD.BillExt) as BillExt_LT_200408
From PR
left join Contacts ON PR.ContactID = Contacts.ContactID
left join CL ON CL.ClientID = PR.ClientID
left join LB ON LB.WBS1 = PR.WBS1 AND PR.WBS2 = LB.WBS2 AND LB.WBS3 = PR.WBS3
left join LD ON LD.WBS1 = PR.WBS1 AND PR.WBS2 = LD.WBS2 AND LD.WBS3 = PR.WBS3 And LD.BilledPeriod < '200408',
CFGMain
Where (PR.WBS3 <> 'ZZZ') and (PR.WBS2 <> 'ZZZ')
Group By PR.WBS1, PR.WBS2, PR.WBS3, PR.LongName, PR.Name, CL.Name, CFGMain.FirmName,
CFGMain.Address1, CFGMain.Address2, CFGMain.Address3,
CFGMain.Address4, Contacts.FirstName, Contacts.LastName,
LB.AmtBud) AS B
ON a.PR.WBS1 = b.PR.WBS1 AND a.WBS2 = b.WBS2 AND a.WBS3 = b.WBS3 AND a.LongName AND a.LongName AND
AND a.Name = a.Name AND a.CLIENTNAME = b.CLIENTNAME AND a.FirmName = b.FirmName AND
a.Address1 = b.Address1 AND a.Address2 = a.Address2 AND a.Address3 = b.Address3 AND
a.Address4 = b.Address4 AND a.FirstName = b.FirstName AND a.LastName = b.LastName AND
a.AmtBud = b.AmtBud|||Damn...I like the CASE...I seem to forget that...

The results should be the same though...are they?|||Hmm.., actually I couldn't get yours to work. There were a few error that I couldn't resolve. But that's ok because the case idea worked.

Thanks,
Laura