at my company we have the following process which I'm trying to implement with Zoho CRM.

We sell a service and I customised the Sales Order module to keep track of each service sold.

As some of our customers are recurrent customers we invoice them every month/every quarter instead of invoicing them after each sale.

When I create an invoice in Invoice module of CRM it doesn't seems like I'm able to associate more than one Sales Order. Is there any way to aggregate more sales orders into one invoice?

Thank you in advance.

Andrea