Reporting Services :: Chart - Group Values Depending On Date Range?

Currently I report our monthly fees broken down into 4 weeks per month by using 4 separate datasets with the following code

SELECT
SUM(Practice.ibvSalesByJob.JobBilledExVAT) AS Sum_JobBilledExVAT
FROM
Practice.ibvSalesByJob
INNER JOIN Practice.idvJobType

[Code] ....

The second dataset then has the date code changed to 

AND Practice.ibvSalesByJob.[Date] >= Cast(@Month AS char(2)) + '/08/' + Cast(@DateYear AS char(4)) + ' 00:00:01'
AND Practice.ibvSalesByJob.[Date] <= Cast(@Month AS char(2)) + '/16/' + Cast(@DateYear AS char(4)) + ' 00:00:00'

The third

AND Practice.ibvSalesByJob.[Date] >= Cast(@Month AS char(2)) + '/16/' + Cast(@DateYear AS char(4)) + ' 00:00:01'
AND Practice.ibvSalesByJob.[Date] <= Cast(@Month AS char(2)) + '/23/' + Cast(@DateYear AS char(4)) + ' 00:00:00'

The fourth

AND Practice.ibvSalesByJob.[Date] >= Cast(@Month AS char(2)) + '/23/' + Cast(@DateYear AS char(4)) + ' 00:00:01'

Now I was hoping so that I could report the above data in one chart and do an expression on the category and group the dates so I would just have one dataset like below but four separate columns saying Week 1, 2 3 and 4 and then the sum filtered in line.

SELECT
SUM(Practice.ibvSalesByJob.JobBilledExVAT) AS Sum_JobBilledExVAT
FROM
Practice.ibvSalesByJob
INNER JOIN Practice.idvJobType

[Code] ....

If I could somehow with SQL tie in all 4 separate datasets and display them as Week 1, 2, 3 and 4 underneath the dataset and selectable.An even simpler solution maybe just understanding how charts work, I can get it so I display the 4 separate weeks in the chart however I can't get the bottom line (Category Group) to display Week 1, 2, 3 and 4.