The TOC feature
is a section that can be added to a report. The section will display information about the current report's items which TocText properties are set.
In a consecutive official release, the TOC will be available for a ReportBook and all of its reports. Then you will be able to gather reports as separate reports in a ReportBook, instead of using SubReport items.
If I am misunderstanding the issue, please open a support ticket and send us a demo project that illustrates the current settings, and images of the expected result.
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