I'm not sure what this kind of arrangement is called, but here is the thing.

Let's say I have N200 million right now, and I prefer to have it fixed in a bank, with weekly standing order payments of N100k drawn from it to another account in another bank - for the next couple of years and beyond. I want it in such a way that under no circumstances would I be able to withdraw anything from that account except the stipulated weekly standing order debits. How do I structure this arrangement, and what kind of interest rate regime would the bank apply?