How to show different groups in same matrix where no parent or child relationship

I am tasked with reproducing a spreadsheet in an SSRS report to save hours of Excel spreadsheet work. I have done all the calculations and got them into a single dataset however I am not able to work out how to display in the same table/matrix. My spreadsheet looks like this:

Column B is a text column used to describe what the figures in each group are showing. Col C is 'Region' grouping.

I have got this far with my matrix - grouping by region and month. This gives me rows 3 to 8 incl of the spreadsheet.

But I am not able to work out how to add the next group of data (rows 9 to 12 in the spreadsheet) into the matrix. Each group of figures would use an expression to pull by a different field so only using single dataset: I still want it to use the region and month exactly the same as the top group. There is no parent or child relationship between the labels in col B in the spreadsheet.

I have tried adding an adjacent group below but it is still trying to keep it as part of the top group.

Is this at all possible?
do I need to have 6 different matrix, placing them together and just hide the month names in the bottom 5?

This is an extract of the data results. The top group counts the uniques customer id, the second group counts the unique sale id, the 3rd group totals the net sale value, the 4th group totals the profit value, the 5th group calculates the total sales and divides by the number of customers, the 6th group calculates the total sales and divides by the number of sales.