@jcalle Did you try to copy&paste objects via Teamviewer's clipboard? You need to allow copying through clipboard in Teamviewer settings but maybe it could be possible between 2 computers? Give it a try
I did wonder if it could be possible to just unzip the bbdoc and just copy/paste the xml into second project and just zip it up again. Not looked closely at the files myself yet so not sure of the BB structure however I did notice its just a plist.