How to divide sprite into smaller sprites?

[drowsy ore]

I have a sprite texture loaded in like this:

func _ready():
    var texture = load('res://assets/Characters/BlueNinja/SpriteSheet.png')```
How can I divide it into a an array of arrays filled with 16x16 textures of this sprite?

[twin leaf]

Why do you wanna do it like this?

Godot has in-built sprite sheet support