Trouble With Temp Tables And UNION Keyword

I'm trying to summarize costs assigned to active jobs for a manufacturing business. I need to aggregate work in process (WIP) cost that resides in labor-transaction and part-transaction tables based on transaction types, and transaction dates. Some transactions increase the WIP cost of the job while others decrease WIP. The business needs to see how much $$ is tied up in each job as of a particular date -- the calculation is:
ToDate (cost of materials and labor assigned to job)
- ToInv (cost of materials returned to inventory)
- ToSales (cost of materials sold).

I developed this query incrementally and, so far, the #ToDate, #ToInv, and #ToSales temp tables seem to be populating with the correct data. My thought was to combine these three tables with a UNION and then extract the grand totals and here's where I started getting the following error:
------------------------------------------
Incorrect syntax near the keyword 'UNION'.
------------------------------------------
The problem is with the UNIONs going into #myTotal.

I would appreciate any help with this. Also, please let me know if you can suggest a better design for this. Thanks!

Below is a simplified version of my query:

--#ToDate
CREATE TABLE #ToDate (JobNum varchar(14), Cost decimal (16,2)
INSERT INTO #ToDate (JobNum, Cost)

--M&S To Date
SELECT pt.jobnum,
SUM(pt.extcost) AS Cost
FROM parttran pt
JOIN jobhead jh ON pt.jobnum=jh.jobnum
WHERE trantype IN ( <valid trans types> )
AND jh.JobReleased = 1
AND pt.TranDate < '2007-9-30'
GROUP BY pt.jobnum

UNION -- This one works ok.

--L&B To Date
SELECT jh.JobNum,
sum(l.LaborRate*l.LaborHrs) + sum(l.BurdenRate*l.BurdenHrs) AS Cost
FROM LaborDtl l
JOIN JobHead jh ON l.JobNum = jh.JobNum
WHERE jh.JobReleased = 1
AND l.PayrollDate < '2007-9-30'
GROUP BY jh.JobNum

--#ToInv
CREATE TABLE #ToInv (JobNum varchar(14), Cost decimal (16,2)
INSERT INTO #ToInv (JobNum, Cost)

SELECT pt.jobnum,
SUM(pt.extcost) AS ToInv
FROM parttran pt
JOIN jobhead jh ON pt.jobnum=jh.jobnum
WHERE trantype IN (<valid trans types>)
AND jh.JobReleased = 1
AND pt.TranDate < '2007-9-30'
GROUP BY pt.jobnum

--#ToSales
CREATE TABLE #ToSales (JobNum varchar(14), Cost decimal (16,2))
INSERT INTO #ToSales (JobNum, Cost)

SELECT pt.jobnum,
SUM(pt.extcost) AS ToInv
FROM parttran pt
JOIN jobhead jh ON pt.jobnum=jh.jobnum
WHERE trantype IN (<valid trans types>)
AND jh.JobReleased = 1
AND pt.TranDate < '2007-9-30'
GROUP BY pt.jobnum

--#myTotal
CREATE TABLE #myTotal (JobNum varchar(14), Cost decimal (16,2), Source varchar(9))
INSERT INTO #myTotal (JobNum, Cost, Source)

SELECT d.JobNum, SUM(d.Cost) AS Cost FROM #ToDate d GROUP BY d.JobNum ORDER BY d.JobNum

UNION -- Problem**********************

SELECT i.JobNum, SUM(-1*i.Cost) AS Cost FROM #ToInv i GROUP BY i.JobNum ORDER BY i.JobNum

UNION -- Problem**********************

SELECT s.JobNum, SUM(-1*s.Cost) AS Cost FROM #ToSales s GROUP BY s.JobNum ORDER BY s.JobNum


--Select grand total for each job
SELECT JobNum, SUM(Cost) FROM #myTotal ORDER BY JobNum

--Drop temp tables
DROP TABLE #ToDate
DROP TABLE #ToInv
DROP TABLE #ToSales
DROP TABLE #myTotal