Is it possible to create a new Revit file from Dynamo?
What do you mean by new file, is this a copy of the original file or is this a brand new project from a template file.
If you are after making a different copy of a file then you will need to open the file as detached then perform a save as of that file accordingly.
Starting from template file then you need to use the following method. NewProjectDocument Method
Should I use this node?