Menus
The main feature of Fluent Catalyst is the menu customizing. When creating an asset you will be able to modify the auto-generated menu.
Inputs
By default, Catalyst will take all the inputs of the selected Geometry Nodes modifier, detect the type and assign it to the main menu.
You can rename an input by Double-clicking on the name.
Show/Hide Inputs
If you want to hide an input in the menu, click on 
Input Changes
If you change any input in the Geometry Nodes, you have the reload the menu inputs using 
Menus
By default, all the inputs are in the main menu. You can add sub-menus and assign them to the inputs.
Like the inputs, you can rename a menu by Double-clicking on the name.
Sub-Menus
To make sub-menus inside other sub-menus, use the Parent menu property