Thank you for this reply.

We are still using Totara v12.

Playing with reports functionality works fine as you say but i'm still finding in the proposed reports a table similar to the teammembers one. I will make it I think.

The thing is that we developed a specific dashboard for manager which is by default showing only n-1 teams members.

Now some managers want to see their whole team using this specific dashboard.  So I tried to add the whole hierarchy using jobassigments. It works fine but notifications are working fine too. Every notification is sent to any manager from one hierarchy. I was my question but I think it's not posible to choose notifications targets, no?

I think that the solution is to revert to the default configuration using standard report functionnalities et let down our dashboard developped specifically.