The wiki page on Wishes lists the command for spawning bits as:

bits[:<>]

Are there some examples that can be given of how to specifically use this command to spawn specific bits?  For example, how I can spawn just 100 A bits using a wish?

Wishing for "bits:10" seems to add 10 bits each to all bit types in inventory - +10 to A, +10 to B, +10 to C, etc.