Orders is where client is related with product.
Order can be created throw Front Office (Client) and BackOffice (System User)
To create a new Order you need to create a Client and a Product first.
Status: Set the status of an order. When you change that field, zBilling runs Plugins in OnOrderUpdate Event, so you can create custom Plugins here. For more information please visit API documentation page.
Billing Cycle: This dropdown values is from Product. You can set your own value for the select Cycle for this order.
Next Billing Date: This is the date for the next payment.
Order Related: This field is dedicate for Domain Products. If your order is a Hosting that includes domain, this field should be fill.