Hi Mikael, Yes you can do that,Every Delivery has its own Delivery Label
and other delivery details in the Broad Log table,from which you can
even fetch the details within the Query audience and populate the data
according to all the columns and conditions you want .
ACS--Audience--Select Audience type--Query--from left filtering
records(choose delivery logs)-->filter with delivery label = or like
'WelcomeEmail' or something then save. So these acts as global segments
and recomputes records base...