I opened a ticket for this request and have started a dialog with Presonus Support.
Right now Sample One and Impact only point to the location the samples are stored on your computer.
If you delete the samples or open the song on a system that doesn't have the samples your instruments will be blank and you will get the notification that there are missing files.
I tried exporting as an Instrument & preset but the samples are not copied with that option.
I will update again as soon as I have any more insight or a work around.
EDIT: Export Sampler File did work.However, if you do not name your tracks and presets (Sampler File) accordingly you may still have issues. You still get an error when opening the song but then you just either drag and drop the .soundx file onto the instrument or import it into the instrument. I personally feel maybe this was something PreSonus may have overlooked. Ideally the samples should be copied into the Media folder or as an alternative the Sampler file should be autogenerated, named and resaved every time the song is saved. Probably copying the samples used to the Media folder would be simplest route, but I'm no programmer. The work around for now will at least be functional, just time consuming.