The file quality/flsun_v400_global_<quality>_Quality.inst.cfg defines some global properties for all nozzle sizes and all materials. Linking global qualities to layer heights is a valid example, but not a must. Cura's intentions seems to be centred on print speed.

<quality> should be replaced with one of the values following values, at least one must be present.

Superdraft (e.g. for layer height of 0.4mm, or a speed of 600mm/s)
Verydraft (e.g. for a layer height of 0.3mm, or a speed of 400mm/s)
Draft (e.g. for a layer height of 0.2mm, or a speed of 300mm/s)
Fast (e.g. for a layer height of 0.15mm, or a speed of 200mm/s)
Normal (e.g. for a layer height of 0.1mm, or a speed of 150mm/s)
High (e.g. for a layer height of 0.06mm, or a speed of 80mm/s)

Variant File

On top of the global quality file, there needs to be setting file for each variant: variants/flsun_v400_<variant>.inst.cfg. The settings in these files are specific to the variant, but are independent of all quality or material settings.

Variants can be whatever machine detail you want to choose. Commonly, this is the nozzle size.

Specific Settings

The third layer of the stack is the quality, material, and variant specific settings in quality/<material>/<variant>/flsun_v400_<variant>_<material>_<quality>_Quality.inst.cfg.

Intentions

Optionally, there can be even more modifications of settings in intent files. They are stored in the intents folder with the name intent <material>/flsun_v400_<variant>_<material>_<quality>_<intent>.inst.cfg.

This file can modify settings that are only relevant for specific intents. Examples for intents are

Dimensional accuracy
Visual Quality
Smooth Surface
etc