Multiple layers of subtotals

I have a list of GL accounts that I want to use to build a multi layered income statement. It seems to me that the easiest way to create a dynamic statement would be to use the subtotal feature for most of it and then just change some of the formulas when I need to actually subtract not sum.

Here is my list of GLs (with just nonsense numbers so I could share it). I can't figure out how to make it automatically do MULTIPLE layers. I can get it to subtotal on ONE column (for example column G which is level 6) but as soon as I click on subtotal again to subtotal level 5, the level 6 subtotals disappear.

Is there a way to do what I am suggesting or do I just need to manually create the whole income statement with groups and pretty formatting?

Thanks in advance!