Task grouping multi level

I want to implement a grouping function, as shown in the image below.


However, a task here might have multiple users. For example, in the diagram, Task #1.1 has both John and Anna as owners. Therefore, when grouping by owner, John and Anna each have their own Task #1.1, instead of John and Anna as a group. as shown in the image below.

How can I modify the settings based on “group by owner” to achieve my desired results?Could you please provide a case study? Thank you very much.

Hello,
Right now, Gantt doesn’t have the feature to create multiple tasks if they belong to several groups. The dev team will add that feature in the future, but I cannot give you any ETA.
For now, you need to implement a custom solution by using the Gantt API and Javascript. When the tasks are grouped, you can clone the tasks that belong to several groups. Then, after a task is updated, you update all relevant tasks.
Here is an example of how it can be implemented: