Groups/sections for accounts... or introduce "Sub-Accounts"

Please introduce Groups for accounts.
So instead of an overwhelming clutter, one can organize similar accounts under groups… e.g. all 6 credit cards under one group (or group account) named “Credit Cards”.

Or we can simply call them Sub-Accounts (like sub-categories).

I hope many users will appreciate this feature.
This feature may also solve/workaround the credit card problem which is in demand highly.