Help creating a 6-Week Rolling 'Matrix Table' using multiple measures

Rolling  in case you have date table ,

Rolling 6 = CALCULATE(sum(Sales[Sales Amount]),DATESINPERIOD('Date'[Date Filer],MAX(Sales[Sales Date]),-6*7,DAY))  

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s.

Refer
https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions
https://www.archerpoint.com/blog/Posts/creating-date-table-power-bi

https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/

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