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Digital money pots?
If you can live with managing the individual category amounts yourself, this is trivial. Just set up a spreadsheet listing each category (and a column for the total amount of money in the account), adding or subtracting as you deposit or withdraw money to the account. To the bank it will be just one (physical) account, but to you, it can be any number of (accounting asset) accounts. You can choose to keep a history, or not. It's all up to how complex you want to make it. It doesn't even have to be a spreadsheet - you can just as well do this on paper if you prefer that. But the computer makes it easier. I imagine most personal finance software will help you, too; I know GnuCash can be coaxed into doing this with only a bit of creativity, and it almost certainly isn't the only one. I do this myself and it works very well. I don't know but imagine that companies do it all the time: there is no reason why there must be a one-to-one relationship between bank accounts and accounting asset accounts, and in fact, doing so would probably quickly become impractical.