Once the revised Split Payment guide is merged into the docs, use the doc as a template to create a new Recurring Payment guide that specifies a debitAmount, rather than an incomingAmount or receiveAmount.

Example use case (use this one in the guide): Send a remittance where the sender will send a fixed amount on a recurring basis (versus the recipient receiving a fixed amount on a recurring basis, that's a different guide).

Melissa has a Whimsical diagram that might help.