modify table during loading queries

[snifer]

I got a table where accounting table where 

account	amont	month
100	2	1
120	3	1
130	4	1
140	5	1
100	2	2
120	6	2
130	0	2
140	7	2

I want display matrix,

columns month

row account

how i can do if i want display as row all account

and then have account 120-100

can i do this in querying?

[Greg_Deckler]

Can you show an example of the output you want?

[snifer]

the result must be a MATRIX:

I guess the best way to do it is by making a calculated table but i don't know how to proceed

ref.(https://community.powerbi.com/t5/Desktop/Power-BI-desktop-create-a-Calculated-Row-in-Matrix-Visualis...)

	month
matrix	1	2
account
100	2	2
120-130	-1	6
140	5	7

I need to display a matrix but I need to have a calculation in the middle row of the matrix.

in the example account 120- account 130 = for month 1 ->3-4=-1

for month 2-> 6-0=6

@Greg_Deckler 

this is how I wish to display it

regardings months I would need to display in the matrix the last 12 months running and not the calendar year