To create a new Preset, you can click this button 
and
choose
- New to create a new Preset from scratch
-
New from ... to
create a new Preset based on an existing Preset.
A list of the existing Presets will appear, allowing you to select the Preset you want to use as starting point for the new Preset.
- New from selected to create a new Preset based on the selected Preset
- New from file to create a new Preset based on a Preset file on disk.