PowerBI Matrix Table with finding difference between two column and display it

Hi pyramid1 ，

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 "transform data" to enter the power query editor, select the [Year] column and [Person] column, and click transpose. Click "Close and apply".

(3) We can create a measure. 

Diff = 
var _a=CALCULATE(SUM('Table'[Value]),FILTER(ALL('Table'),'Table'[Person]=MAX('Table'[Person]) && 'Table'[Attribute]=MAX('Table'[Attribute]) && 'Table'[Year]=2022))
var _b=CALCULATE(SUM('Table'[Value]),FILTER(ALL('Table'),'Table'[Person]=MAX('Table'[Person]) && 'Table'[Attribute]=MAX('Table'[Attribute]) && 'Table'[Year]=2021))
var _d=FORMAT(_a-_b,"Fixed")
var _c=IF(_a-_b < 0, "-" & "$"& _d,"$" & _d)
return IF(SELECTEDVALUE('Table'[Year])=2021,BLANK(),_c)

(4) Then the result is as follows.

Due to the design of the power bi desktop, the matrix may not display exactly what you expect. You can create a shapes in the [Insert] pane and set its background color to white and no border to block the fields you don't want to display.

Best Regards,

Neeko Tang

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