Sub-accounts (retirement, children, emergency fund, etc.)

Hello everyone, I would like to suggest a functionality that would allow creating sub-accounts under Invest (for day trading there is already a separate account) which can have its own name and purpose. One may have different goals in life, like (1) investing for better future while retired with high allocation of stocks/stock ETFs, (2) creating safe and quite liquid emergency fund with let’s say 60 % bond ETFs and 40 % stock ETFs, (3) investing/saving for children’s tuition fees, etc. (for kid 1, kid 2 starting different year).
Each sub-account would have its own pie chart, stats, transactions list.