The "Report Designer" allows you to build reports with CRM data using several levels of grouping and calculated values using functions.
Full description is here
Note: A 30-days trial is free. Because Bitrix24 Marketplace does not yet support apps billing, everything is marked as free. The current price is here
Scheduled reports by company.
Reports by lists.
Reports by tasks.
Added publishing to activity stream
You can create a custom report using calculated fields and a multi-level structure.
The customer support is provided by "Report Designer" Integration interface.
Also you can use this link
for customer support.
The app is installed automatically from Bitrix24 Marketplace.
Documentation can be found here