Subaccount for DCA plan

Hello,

I plan to create a DCA sub-account for my daughters (!). I don't want to pay extra fees, so normally, the approach can be:

1. create a separate, sub account
2. send the 1st of the month e.g. 50€ via SEPA
3. With an automation (at least via API) the 10th of the month buy 50€ of crypto

I have some issues:

1. I don't find the sub-account feature. It's only a corporate feature? Do I need to another account? Can I create 2 accounts with my data?
2. This is OK
3. I presume Binance don't have a planned operation and I need to act via API, it's right? I can do it (I'm a developer) but if it's present by design can be much better.

Do you have some tricks or work-around for these issues?

Thanks