In the event, you have a customer who subscribed to one plan and then wants to change their subscription plan to, for example, go on a more expensive or less expensive plan, you can easily change their active plan and their monthly charge.
If you visit the subscription detail for a customer's subscription that is subscribed to a plan based project, you'll find a Change Plan button.
When clicking on it a modal window will open where you can select a new plan for the subscription.
When a new plan is selected the change in the monthly plan amount will be shown with the difference between the current and new situation.
After saving, the new monthly amount will be charged on the next charge date so use with caution!