Our mutual client has requested support for implementing the Customer Hierarchy (Parent/Sub-Customer structure) within our existing workflow.

At the moment, all invoices are being created in Zoho under the main (parent) customer account. However, this approach is causing issues on the client’s side, particularly with accounting processes and reconciliation of transactions.

The client would like us to adjust the integration so that:

- Sub-customers are created and properly associated with a parent customer

- Invoices are generated under the appropriate sub-customer rather than the main account

Our development team has reviewed the available Zoho API documentation but has not been able to identify the required request parameters or endpoints needed to:

1. Create a sub-customer linked to a parent customer

2. Assign or associate invoices specifically to that sub-customer within the hierarchy

We would greatly appreciate your guidance on the following:

- What API fields or parameters should be used to define a parent-child (customer hierarchy) relationship?

- Is there a specific endpoint or method required to create sub-customers under an existing parent?

- How should invoices be properly linked to a sub-customer instead of the parent customer?

Thank you in advance for your assistance. We look forward to your guidance so we can properly implement this functionality for our client.