Incorrect syntax near the keyword 'where'.

Your table names give me anxiety, i pity whoever has to maintain that schema. I tried to create your tables as var tables to make this replicatable but i got frustrated.

In short, you need to invest in some sort of code formatting plugin or force yourself to better format your code.

Select
 DATA0006_1.RKEY as D6_Rkey,
 sum((DATA0447_1.TVALUE + DATA0056_1.ELAPSED_TIME) * DATA0034_1.COST_DRIVER) as totHcost
 
FROM DATA0059 DATA0059_1 WITH (NOLOCK)
INNER JOIN DATA0056 DATA0056 WITH (NOLOCK) ON DATA0059_1.TPUT_PTR = DATA0056_1.RKEY
INNER JOIN DATA0006 DATA0006_1 WITH(NOLOCK) ON DATA0006_1.RKEY = DATA0056_1.WOPTR
INNER JOIN  DATA0447 DATA0447_1 WITH (NOLOCK) 
INNER JOIN DATA0445 DATA0445_1 WITH (NOLOCK) ON DATA0447_1.SOURCE_PTR = DATA0445_1.RKEY
INNER JOIN DATA0006 DATA0006_1 WITH (NOLOCK) ON DATA0006_1.RKEY = DATA0445_1.WOPTR
LEFT OUTER JOIN DATA0017 DATA0017_1 WITH (NOLOCK) ON DATA0017_1.RKEY = DATA0006_1.INVENTORY_PTR
INNER JOIN DATA0034 DATA0034_1 WITH (NOLOCK) ON DATA0034_1.RKEY = DATA0445_1.WCPTR
LEFT OUTER JOIN DATA0050 DATA0050_1 WITH (NOLOCK) ON DATA0050_1.RKEY = DATA0006_1.CUST_PART_PTR
INNER JOIN DATA0005 DATA0005_1 WITH (NOLOCK) ON DATA0005_1.RKEY = DATA0445_1.EMPL_PTR
INNER JOIN DATA0135 DATA0135_1 WITH (NOLOCK)  ON DATA0135_1.RKEY = DATA0445_1.PARAM_PTR 
Where
 (DATA0445_1.TDATE > '11/11/2010') AND (DATA0056_1.TDATE > '11/11/2010')
 group by DATA0006_1.RKEY
Order By
 DATA0006_1.RKEY

Without being able to execute this query, the big issue i see is that you don't have the ON clause for one of the joins

INNER JOIN DATA0006 DATA0006_1 WITH(NOLOCK) ON DATA0006_1.RKEY = DATA0056_1.WOPTR
INNER JOIN  DATA0447 DATA0447_1 WITH (NOLOCK) 
INNER JOIN DATA0445 DATA0445_1 WITH (NOLOCK) ON DATA0447_1.SOURCE_PTR = DATA0445_1.RKEY

See DATA0447 WITH NO LOCK has no ON < table.column > = < table.column > clause?

That is more than likely your issue.