How to change piano piece to string quartet?

How I would go about changing a short piece I arranged for piano into a string quartet piece. It's okay if I gotta manually change some notes and stuff, but I'm hoping there's a button that just does most of it automatically.

Currently there's only 2 voices being used in it, so I'm assuming I'd probably have to go in and set everything up for 4 separate voices first which I can do because the thing was written for string quartet in mind anyways.