(SSRS) Tablix advanced grouping, hide cells and align cells

Question

I am trying to achieve a result like below (edited in paint):

But so far I have only achieved this:

As you can see, I get whitespace cells between the timestamps and values above, probably due to the cells above that is manuipulating the tablix layout.

How can I make the values cells become "snapped" next to the timestamps like the first picture?

This is how it looks in SSRS:

Answer 1

According to your image, seems you could not achieve your goal in your current Tablix design . you need to change your report design using list , like below:

(add one more table in the list to display header) In this scenario , you should make sure that you have the full records under the group Meter2 and Interval2 to make up the column group cells. Otherwise you could get like below: