When I say ‘build a project’ - I mean add drum kits, tweak songs, build folders and song lists - whatever you want done to your project so you have a project tailored to your needs. Once you’ve made all the adjustments to the project saved on the computer, then do a wipe on the SD card. Re-open the project you’ve tweaked on the computer then do a ‘save as’ or ‘export > synchronize to SD card’ to the SD card.
Does that make sense?
Apologies if I’ve oversimplified this but each project folder is a box into which you load drumsets, effects, parameters, songs etc. You can save as many projects to your computer as you want (under different file names) but you can only save one project to the SD card. If you load the contents of a project folder from your computer onto your SD card, you will have a complete kit for your BB. BBManager lets you save to the SD card two ways - ‘save as’ and ‘export > synchronize to SD card’.
I actually prefer to work from the project on the SD card then save backups to the computer. The BB workflow seems set up to work the projects from the computer then move them to the SD card but the commands support managing projects either way.
Keep in mind that the BB uses its folders and files in unique combinations and organization so you must do your project work in the BBManager. If you use the Windows or Mac OS to move files and folders in a project, those changes probably won’t be recognized by the BB.
The BBManager has all the commands necessary to manipulate the drum kits, arrange songs and set up folders/song lists. Since a song consists of multiple smaller midi and wav files, you can only use the BBManager to organize those midi and wav files into songs. There’s a separate piece of software available on the forum to do midi manipulations of those lower-level files (the main loops, the fills, the intro and outro, and the transitions are midi. I think the accent hits are wav files) or you can use a separate midi editor. I have yet to do anything outside BBManager so I can’t help you with midi editing.