To add a consortium.
While in the Results form:
Click Tendering parties on the left-side menu.
Click + Add tendering party
Select the suppliers (at least 2) under the Tendering party members drop down
Select a Group leader
Click Tendering parties on the left side menu, after successfully filling the fields.
The filled-in information has been automatically saved. You should be able to see the Consortium added under the list of Tendering parties.