...
Navigate to Main > Catalog > Charges
If the charge should have a Parent folder/hierarchy, navigate there.
Click Add
Provide Name, Description, Type, Default Amount modeled on a similar charge catalog item
Check Allow Override Amount if default amount should be customizable per instance
Set Qty to Disabled if this charge is only billed in full, to Whole if it scales per unit (for instance, if the charge is per GB and will be multiplied by a number of GB)
Set Revenue and Expense exactly as found on another similar charge catalog item, if not provided by the Parent.
Click Save and review your addition.
If you are adding a Monthly Recurring charge, make sure to create a matching Annual Recurring version whose charge code has “Y” affixed to the front of its name.
Modify
When you modify the price for a recurring charge, make sure to select Update – Date to Last Billed so that the next billing cycle uses only the new price. (Otherwise the customer may be billed twice, once at the old price and once at the new.) [PCR-360 Documentation]
...