New Marking Up Footage

When I begin editing my footage, it's vital that I know where all the clips are, and what each clip shows to save time. In iMovie, I created two bins named part 1 and part 2, referencing the two different sections of clip I filmed separately.

If I opened one of these bins, I find a series of bins with different names and a 3 digit code, for example BS1, which means balaclava struggle 1.

If I wanted a certain bit of footage, I would open one of these folders and use my code to figure out what bit of footage shows what to select it.

The code to decide which bit of footage to use is the following,