Elegant way to copy a file from one database to another

how to I copy one file of a database to another without export and import. Is that possible.
I couldn’t find good search tearms. All my tries gave me 1700 post. Excuse my question, but I can’t read all of them. I can’t image that I am the first one with this question. Sorry to bother. Just the right searchtearms would do fine.

Thanks a lot![/i]