Yes, U can add samples to the track with using the self contain setting.
And this is a must, if U want to play the song on another computer and U want to have the track complete with all sounds.

But there's another problem with transporting songs. The refills used in current song have to appear on the machine to which U transport the song. there is no setting which lock the sounds from refills to the song.

so, be carefull if the computer where you want to transport the track contains the refills, used in. :!: