I have seen it asked for multiple times and don't understand why it wasn't a thing to begin with, even more I don't understand why it is being ignored. Why, in the budget section, do subcategories not draw from an amount placed in the main category? Is this not a logical function?

For example, if I have a category of "bills" and I allocate $1000 each month, why does the subcategory "bills:mobile phone" not decrease the main category of "bills" to $900 when I put the $100 bill in my ledger? This would make the budgeting part of this app so much more usable, and would mean I actually use it. Right now it is too cumbersome to bother with it.