Comment 4 for bug 2036404

ok, this is as I said previously:

this dialog is a contribution (not my code)
each level1 can also have its own input, that comes to addition of the level2
=> in your 2nd image, you can input budget for parent auto/moto category as well

when you collapse a level1, only the level1 input remains visible which are empty in your use case.
for now it seems difficult to display a sum of level 2 and the distinct level1 input in the same line