How can I create a deal with multiple payment milestones in Zoho CRM?

How can I create a deal with multiple payment milestones in Zoho CRM?

Hi. We are a services based company and most of our deals involve monthly invoicing for T&M work or payment milestones for fixed price projects. How can I create a Deal in CRM that shows monthly (or multiple) payment milestones, rather than just the total amount, so that I can forecast accurately?