For copy timeline to source, insert video track, and remove video track.
Is not the same as Add Video Track.
I guess, that you try to make one whole clip of all videotracks in layers including multiple clips and add it into a new added layer?
This is not possible! “You cannot add a project to itself”.
These have been added to the next version 19.09:
- Ctrl+Alt+C - Copy Timeline to Source
- Ctrl+Alt+I - Insert Track
- Ctrl+Alt+U - Remove Track
Thank you sir.