I have a Matrix in PowerBI which is showing data for 2 months (month is a string not a date column like Aug, Sept or any selected 2 months). Matrix shows me Total for both months, instead of Sum i need the difference (reduction or addition) between 2 months. Is it doable?
It seems that you are interested in data for 2 specific months (perhaps current month and the previous month). I would solve your task by adding 3 new measures - one to sum the values for the current month, the second - for the previous month and the 3rd - for the difference. Those measures can be visualized either in a table or in a matrix (with no fields placed in the column area)
PS: While me writing the above comment you have posted the screenshot with your matrix. I don't quite understand your example as requirements and structrure. Therefore please ignore my idea for a solution posted before
1st column for a particular Date shows total number of Employees, 2nd column is the difference. So in the case of 1st month in the table it shows the same number as it doenst have anything to compare with (should be 0). All other months shows the difference between the month with the previous month.