I have attached a screenshot with a solution to part of your problem. I addressed-'how to calculate WoW in tableau'.
To calculate Week over Week, you just need to add a table calc, 'Difference From' and select 'Table (Across)'.
I have also attached the workbook.
I am sure it must be possible to format it in the way you want, but I am not sure if its straightforward. I'll keep you posted on that if I find a solution.
Hope this helps,
WOW Calc.twbx 1.1 MB
Thanks Suraj. Is there a way to edit the heading for WoW?