A recurring billing schedule can be modified only when the Sublease is not released.
Select Leases > Subleases.
Select an unreleased sublease and navigate to the Billing Schedule tab.
Click 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.