Creating Revenue Recognition Waterfall

Hi Everyone,

First post and in need of suggestions.

So here's the setup: A customer purchases a service which lasts 6-months. As such, revenue recognition for the company can only occur as the service is provided. So if a person orders a $600 service at the beginning of a month, revenue will be recognized at $100 for the next 6 months

I'm trying to create an Excel Waterfall chart which will show the monthly revenue recognition amounts for all orders depending on the date which they were ordered.

I've attached a sample of what I'm looking to do. It's become tricky for me because Revenue Recognition is pro-rated based on the date ordered (i.e. order on the 20th of a month so at the end of the month 1/3 of the month is recognized as revenue)

I'm looking for something that will populate the percentage of the order amount, each month, that will be recognized. I've populated what row 3 should be, but there doesn't seem to be an easy way to apply a formula or something across all cells

Any suggestions are greatly appreciated.