Scope
I want to create customized pricing of addon/charges for some of my subscriptions
I want to change the price of addon/charge for a few plans. 
Solution
You may choose to give some customers or some subscriptions a decreased or increased price of an existing addon or charge. This can be achieved through price override: editing the price amount of the addon or coupon attached to the customer/subscription. 
| Price override | Differential Pricing | 
| Customized at customer or subscription level | Customized at the plan level | 
| The price of addon or charge is changed either while creating the subscription or at the customer level | The prices are edited by using the ‘Differential Pricing’ link at the bottom of the specific addon or charge.  | 
| The changes applied do not affect the other subscriptions or customers  
 | The changes apply to all the new subscriptions with the addon/charge as well as new charges for customers  | 
| more information on price override is available here | more information on differential pricing is available here |