Parent-Child

jvandyck , not enough info for a quick solution; but you might want to refer to this document concerning such a Parent-Child question.

jvandyck , Task should rollup.

Can you share sample data and sample output in table format? Or a sample pbix after removing sensitive data.

This is the structure....it is not parent-child in dax terminology...

So on my report, I have a listbar populated with team. An indicator shows the open tasks for the selected team.

Now I want to add a measure not only showing the open tasks for the selected team, but for all teams within the region.

So if I select Mons in the listbar, I want to show the open tasks for Mons, Liege and Jambes.

I hope this clarifies what I want to achieve....

jvandyck , In this case, prefer the slicer is coming from an independent teams table( Not joined or not from teams column in the table)

Try measure like

measure =
var _region = summarize(filter(Table, Table[team]=selectedvalue(Table[team])), Table[region])
return
calculate(sum(Table[open tasks]), filter(Table, Table[region] in _region))