I work with worldwide guideline and according to that you have:
-1folder per song
-1 master session per song (MST)
-no slave session (SLV) limitation but everything correctly labelled (ex: song name DI editing SLV), but all SLV session result go to MST session.
every event you record has a sync point, or a start point if you will
sometimes cubase places this sync point not at the begging of the event edge, or at the beginning of the punch in. it will align the sync point to the nearest grid point sometimes... if you drag the take in grid mode, you're likely to actually offset the clip. you should always use grid relative mode when moving events forward or backwards.... unless you use nudge (which is relative by default).