The above information is correct. The easiest way to create a new Program from a blank slate would be to load the User 2 list which is full of INIT Programs (blank programs), and then press the Presets button on the H90 to select a new Preset for Slot A or B.
https://cdn.eventideaudio.com/manuals/h90/1.5.2/content/edit-modes/presets.html
