After a simple search on the forum you’ll find that part of this question has been answered already…
There are quite a few nodes out there that get linked documents, then you can get the elements by category (in your case, the “Level” category). Once these have been retirieved you can get the “Elevation” parameter and “Name” parameter and then create new Levels in the current Revit document based on these parameter values.
Beware to make sure the Level names are unique or you will not be able to create them, Revit rules still apply when using Dynamo.
The scope box is a different Kettle of fish, I can’t help presently as I am not near a computer, however, hypothetically you would need to get the scope boxes bounding box and min/max coordinates, then apply these to a “create scope box” node (I do not know if one exists already, maybe someone knows if there is, but if it is supported in the API then it shouldn’t be hard for anyone with API programming knowledge to knock one up quickly, I would suggest posting the scope box question as a separate thread after doing some research first to make sure there aren’t similar threads here already).
Cheers,
Dan