A recurring billing schedule can be modified only when the Sublease is not released.
Select Subleases.
Open a sublease record.
On the Billing Schedule tab, select
Recurring Billing.
Specify the beginning and ending dates in the Payment Date Range field.
In the Actions section, select Update
Amounts.
Specify the new Payment Amount for
the recurring billing.
Click Submit.
The payment amount is automatically updated for all billing schedule lines
within the payment date range that were created using the recurring billing
schedule.