Just wondering if this is an option. It would be a time saver.
I gues ‘“Save As Project Template” is the way to go. It is under file menu.
I’m afraid not, no, though it’s an interesting idea. The challenge is how you would intersperse the instruments from the project into the overall order? I guess you would have to do something like start with, say, the Orchestral score order and pull out all of the instruments in the project from that order and insert them at the start of the order. (An instrument score order always has to include all of the instrument types that Dorico knows about.)