We want to create fixed billing cicles and therefore, needs to create proportional billing as below.

Billing Cicle 1: From 1st of month to 31st of month, due on 10th of month

If we activate a customer on this billing cicle on the 20th of July, for a service that costs USD 80, the first invoice would look like this:

1)- August billing cicle from Aug 1st to Aug 31st - USD 80

2)- July billing cicle from July 20th to July 30th - USD 26.67

3)- Total invoice USD 106.67

From September on, the due date will be on every 10th and the value charged will be only USD 80.

Can Zoho Books understand this somehow?