The service lets you make reports using data from multiple counters that have the same tag set.
These types of reports have the basic Yandex.Metrica features (for example, segmentation, settings for dimensions and metrics, and attribution), but do not have information for goals, WebVisor data, or maps.
Reports are generated based only on the tags you created (not system tags).
To make a report for multiple counters:
Go to the report:
On the page with the list of counters, select the set tag from the list of tags (the All tags button). A page opens with data totals for the selected counters. To go to a detailed report, click Summary report.