Metronome..... ie......Synth Tracks

Question on how the Metronome works

I used the metronome to as a click track when I recorded my band. When I did n-track added 4 Synth track with the first one being the click that I set as a rimshot. I wondering what the other 4 tracks are used for I would like to use them for drum fill ins…ect. But I cant seem to add or change drum sounds to any tracks other than the primary click. I am also wondering if there is any way to look at these tracks in the timeline so that I can fade them in and out of the song as needed

Any help would be greatly appreciated

Thanks Jason