It’s possible but not in an automated fashion.
You can create a recurring invoice and set auto-collection via Direct Debit. This however will create a new invoice according to your schedule and raise a collection for each.
If you would prefer a single invoice with multiple down payments, then I’m afraid you would need to manually go into that invoice once per month and make a Direct Debit request against the invoice for a lower amount.
We have a bit more information on this here: