quantity cumulated with details

[Broly221]

Hi, I'm struggling to figure this out :

here is my table :

I'm currently displaying this previous table in a matrix by category :

Now I would like to add the total of the previous month for each month. For example in april we would have 1206 + 720 - 52 = 1872. Kinda like a cummulated quantities. The issue when I display the cumulated quantities it doesn't give me the deails of the calculation : 

is there any way to display the total of the cumulated quantites  but the details of the normal quantity ? 

Thank you for your help

[Greg_Deckler]

@Broly221 Well, if you do something like this: Better Running Total - Microsoft Power BI Community. You could probably get there using CONCATENATEX with a separator of UNICHAR(10) & UNICHAR(13) potentially.