[Team for Capella] How to manually add new RealizationLinks


I have been playing around with Team for Capella; however, I am somehow unable to find out how to manually add new RealizationLinks between model-elements belonging to different ARCADIA stages.
When using Capella without the Team4Capella add-on, I would directly edit the EMF-model contained in the *.capella-file. This does not seem to be possible when using Team4Capella.
Could anybody give me some pointers how to create new Links?
I would greatly appreciate any help and pointers!

Thank you!
With best regard,