I use my different Bunq account numbers for different budgets. Some months I'm lucky and some money of some of these budgets remain unused. I would like a feature that automatically transfers all the remaining money in these accounts on a certain date or even better when my salary arrives (or maybe both options)

Another option would be that when I auto split my salary over these budget accounts it doesn't transfer the absolute amount, butt supplements the remaining money in the account number to the amount I specified.( e.g.: when the amount specified is 500 euros and there is still 150 euros in the receiving acount, the auto split function transfers only 350 euros)