Within Zoho One how would I add functionality that let me merge hours from different customers/clients/accounts (entered from People) onto one invoice.

In CRM we have clients with parent/child relationships. Those marked as clients would need to be rolled into their parents time and then billed.

As long as I have a record of the original time entered and which customer/client/account it went to I can report on it later. In other words I want to make hours as being invoiced and even if they show up on a different invoice.

Would creating an interface between People->Creator->Books allow me to combine the time? I would prefer the invoice come out of books so I can email and track payments.