Get Rid Of Unwanted Brushes
You probably already know that you can add a brush to the Brushes palette, but did you know that it’s even easier to delete them? Just hold the Option key (PC: Alt key) and you’ll notice that your cursor changes into a pair of scissors. Click once on the brush you want to delete and that baby’s gone—no warning dialog, no chance to change your mind—it’s gone.
I figured out how to delete brushes. It’s easy, as you have mentioned.
I have not figured out how to create a new brush, nor how to have a new set of brushes that I want to create displayed with their name, e.g., Fibonacci Simple.
I used to know how to do these things before Photoshop turned into a ridiculously complicated monster. Alas, those days are gone.