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Hi surajde ,

According to your description, here are my steps you can follow as a solution.

(1) My test data is the same as yours.

(2)Click on "transform data" to enter the power query and add index a column.

(3) We can create calculated columns.

Column = MAXX(FILTER('Table',[Request ID]=EARLIER('Table'[Request ID])&&[Index]=EARLIER('Table'[Index])-1),[Group Name])

Column 2 = IF(OR([Column]=BLANK(),[Group Name]<>[Column]),[Request Modified on ])

Column 3 = var a=MAXX(FILTER('Table',[Request ID]=EARLIER('Table'[Request ID])&&[Group Name]=EARLIER('Table'[Group Name])&&[Index]<EARLIER('Table'[Index])&&[Column 2]<>BLANK()),[Index])
return IF([Column 2]<>BLANK(),[Column 2],IF([Group Name]=[Column],LOOKUPVALUE('Table'[Column 2],'Table'[Index],a)))

(4) Then the result is as follows.

Best Regards,

Neeko Tang

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