I'm not sure if you are asking what command it served under or asking how to add a profile in WikiTree.
The 487th Bombardment Group was part of the 8th Air Force stationed in Lavenham, Suffolk, UK during WW2.
with the proposed structure almost ready to be accepted, it should end up as using this is the profile of the person:
[[Category: 487th Bombardment Group (Heavy), United States Army Air Forces, World War II]]
on that category page, it will have category entries linking it under the operational commands:
The group was an element of these wings, which were elements of the Eighth Air Force.
units moved around, got renamed, reorganized... it is hard to keep track of them and what units they were a part of, and what units they were made up from, without identifying a specific timeframe.