Click Projects from the left menu.
Go to Sessions.
Select sessions that need to be moved.
Example: In this case two sub-01 sessions should be assigned to sub-04.
Click Actions from the above menu.
Select Move Sessions to Subject.
Choose the project to which the subject needs to be added.
In this case sub-01 sessions should go to the OpenNeuro_BIDS project.
Choose Existing Subject, and select the subject to which sessions need to be added.In this case we are adding the sessions to sub-04.
You can see the sessions have been added to existing selected subject.
The sessions now appear in sub-04.