When I am producing music, I find I do the same thing over and over. When I am writing out a harmony I need to either play it live or write out different chords to test them out in the track. I have also found having a library of MIDI chords useful for triggering certain chords during a performance. To save me the time I made a library of chords separated by their key that I can just drag and drop.
My desire to save time is what gave birth to the MIDI Chord Library. I have a folder for the different keys in their major or minor. When you download this Library, you can navigate to Chords/Major/C Major Key/ there you can see all the chords in that key and drag them in the session.
I also used the Circle of Fifths Sticker to have all the clips be colored in such a way it is easy to harmonically mix and see what is happening. If you are unfamiliar with this technique, then check out my article on the circle of fifths.