Hello chrismartin97,

Thanks for reaching out to the Community! As of right now, there isn't a way for you to add your own prediction for the cash flow planner. QuickBooks is set up to do it automatically. What I can do is submit feedback to our Developers about including this in the future. I encourage you to do the same, and you can even manage the requests.

If you have any other questions, don't hesitate to let me know! I will be around. Take care!