Can you rephrase the question? If the position is from a game or line already in the database, you can simply search for it. If it's not, you need to simply add the game or line leading to the position in the database.
I'm not sure about simply copying and pasting a position without any moves, but I think if you open a new board and then use position setup, you should be able to copy the position into the database. I haven't tried that, but it's worth a shot.